From 0eeea802f05aaa5dd289cea6d9d2c3125f2d8037 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 16:46:20 +0900
Subject: [PATCH 01/51] docs(readme): add the list to implement

---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README.md b/README.md
index e6ed1056f..f5500480a 100644
--- a/README.md
+++ b/README.md
@@ -468,3 +468,12 @@ public class StationRepository {
 ## 📝 License
 
 This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/blob/master/LICENSE.md) licensed.
+
+<br>
+
+## ☑ 구현할 기능 목록
+
+- [ ] 메인
+  - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다
+  - [ ] 사용자 입력에 따라 기능을 불러 온다
+  - [ ] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
\ No newline at end of file

From 46283bf4b32069dcec8c99f4fc35556db4201409 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 16:47:29 +0900
Subject: [PATCH 02/51] feat(manager): implement select function and validate
 function code input

---
 src/main/java/subway/Application.java         |  4 +-
 src/main/java/subway/FunctionValidator.java   | 13 +++++
 src/main/java/subway/Manager.java             | 47 +++++++++++++++++++
 src/main/java/subway/constant/Function.java   | 30 ++++++++++++
 .../java/subway/constant/Information.java     |  6 +++
 .../exception/InvalidInputException.java      | 22 +++++++++
 6 files changed, 121 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/subway/FunctionValidator.java
 create mode 100644 src/main/java/subway/Manager.java
 create mode 100644 src/main/java/subway/constant/Function.java
 create mode 100644 src/main/java/subway/constant/Information.java
 create mode 100644 src/main/java/subway/exception/InvalidInputException.java

diff --git a/src/main/java/subway/Application.java b/src/main/java/subway/Application.java
index 0bcf786cc..ccaa011f7 100644
--- a/src/main/java/subway/Application.java
+++ b/src/main/java/subway/Application.java
@@ -3,8 +3,10 @@
 import java.util.Scanner;
 
 public class Application {
+
     public static void main(String[] args) {
         final Scanner scanner = new Scanner(System.in);
-        // TODO: 프로그램 구현
+        Manager manager = new Manager(scanner);
+        manager.start();
     }
 }
diff --git a/src/main/java/subway/FunctionValidator.java b/src/main/java/subway/FunctionValidator.java
new file mode 100644
index 000000000..970908d6a
--- /dev/null
+++ b/src/main/java/subway/FunctionValidator.java
@@ -0,0 +1,13 @@
+package subway;
+
+import subway.constant.Function;
+import subway.exception.InvalidInputException;
+
+
+public class FunctionValidator {
+
+    public void validate(String input) throws InvalidInputException {
+        if (!Function.isAvailable(input))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_FUNCTION_CODE);
+    }
+}
diff --git a/src/main/java/subway/Manager.java b/src/main/java/subway/Manager.java
new file mode 100644
index 000000000..ebdfca559
--- /dev/null
+++ b/src/main/java/subway/Manager.java
@@ -0,0 +1,47 @@
+package subway;
+
+import subway.constant.Information;
+import subway.exception.InvalidInputException;
+
+import java.util.Scanner;
+
+public class Manager {
+
+    private Scanner scanner;
+    private FunctionValidator functionValidator = new FunctionValidator();
+    private boolean isContinue = true;
+
+    public Manager(Scanner scanner) {
+        this.scanner = scanner;
+    }
+
+
+    public void start() {
+        initParams();
+        while (isContinue)
+            runFunction();
+    }
+
+    private void initParams() {
+        // TODO 노선도 초기화
+    }
+
+    private void runFunction() {
+        try {
+            String selectedFunction = selectFunction();
+        } catch (InvalidInputException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private String selectFunction() throws InvalidInputException {
+        String line = getFunctionInput();
+        functionValidator.validate(line);
+        return line;
+    }
+
+    private String getFunctionInput() {
+        System.out.println(Information.MAIN_INFO);
+        return scanner.nextLine();
+    }
+}
diff --git a/src/main/java/subway/constant/Function.java b/src/main/java/subway/constant/Function.java
new file mode 100644
index 000000000..2beac2e3c
--- /dev/null
+++ b/src/main/java/subway/constant/Function.java
@@ -0,0 +1,30 @@
+package subway.constant;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public enum Function {
+
+    MANAGE_STATION("1"),
+    MANAGE_LINE("2"),
+    MANAGE_ROUTE("3"),
+    PRINT_MAP("4"),
+    QUIT("Q");
+
+    private static List<String> functionCodes = new ArrayList<>();
+    private String code;
+
+    Function(String code) {
+        this.code = code;
+    }
+
+    public static boolean isAvailable(String input) {
+        initFunctionValues();
+        return functionCodes.contains(input);
+    }
+
+    private static void initFunctionValues() {
+        for (Function function : Function.values())
+            functionCodes.add(function.code);
+    }
+}
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
new file mode 100644
index 000000000..cd2e684db
--- /dev/null
+++ b/src/main/java/subway/constant/Information.java
@@ -0,0 +1,6 @@
+package subway.constant;
+
+public class Information {
+
+    public static final String MAIN_INFO = "\n## 메인 화면\n1. 역 관리\n2. 노선 관리\n3. 구간 관리\n4. 지하철 노선도 출력\nQ. 종료\n\n## 원하는 기능을 선택하세요.";
+}
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
new file mode 100644
index 000000000..22b7094e3
--- /dev/null
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -0,0 +1,22 @@
+package subway.exception;
+
+public class InvalidInputException extends RuntimeException {
+
+    public enum ExceptionCode {
+        INVALID_FUNCTION_CODE
+    }
+
+    private final String HEADER = "\n[ERROR] ";
+
+    private ExceptionCode exceptionCode;
+
+    public InvalidInputException(ExceptionCode exceptionCode) {
+        this.exceptionCode = exceptionCode;
+    }
+
+    public String getMessage() {
+        if (exceptionCode.equals(ExceptionCode.INVALID_FUNCTION_CODE))
+            return HEADER + "선택할 수 없는 기능입니다.";
+        return "";
+    }
+}

From 78f99df50b692b87d40d32f2aa8de348fc6a64b0 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 17:19:40 +0900
Subject: [PATCH 03/51] feat(main): implement run service on user input

---
 README.md                                     |  4 +-
 src/main/java/subway/Application.java         |  6 +-
 src/main/java/subway/Manager.java             | 47 --------------
 ...onValidator.java => ServiceValidator.java} |  6 +-
 src/main/java/subway/constant/Function.java   | 30 ---------
 .../java/subway/constant/Information.java     |  8 ++-
 src/main/java/subway/constant/Service.java    | 34 ++++++++++
 src/main/java/subway/domain/Map.java          |  8 +++
 src/main/java/subway/service/AreaService.java | 18 +++++
 src/main/java/subway/service/LineService.java | 18 +++++
 src/main/java/subway/service/MainService.java | 65 +++++++++++++++++++
 src/main/java/subway/service/MapService.java  | 10 +++
 .../java/subway/service/StationService.java   | 18 +++++
 13 files changed, 187 insertions(+), 85 deletions(-)
 delete mode 100644 src/main/java/subway/Manager.java
 rename src/main/java/subway/{FunctionValidator.java => ServiceValidator.java} (69%)
 delete mode 100644 src/main/java/subway/constant/Function.java
 create mode 100644 src/main/java/subway/constant/Service.java
 create mode 100644 src/main/java/subway/domain/Map.java
 create mode 100644 src/main/java/subway/service/AreaService.java
 create mode 100644 src/main/java/subway/service/LineService.java
 create mode 100644 src/main/java/subway/service/MainService.java
 create mode 100644 src/main/java/subway/service/MapService.java
 create mode 100644 src/main/java/subway/service/StationService.java

diff --git a/README.md b/README.md
index f5500480a..68c645160 100644
--- a/README.md
+++ b/README.md
@@ -474,6 +474,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 ## ☑ 구현할 기능 목록
 
 - [ ] 메인
-  - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다
-  - [ ] 사용자 입력에 따라 기능을 불러 온다
+  - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다
+  - [x] 사용자 입력에 따라 기능을 실행한다
   - [ ] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
\ No newline at end of file
diff --git a/src/main/java/subway/Application.java b/src/main/java/subway/Application.java
index ccaa011f7..e0f99c035 100644
--- a/src/main/java/subway/Application.java
+++ b/src/main/java/subway/Application.java
@@ -1,12 +1,14 @@
 package subway;
 
+import subway.service.MainService;
+
 import java.util.Scanner;
 
 public class Application {
 
     public static void main(String[] args) {
         final Scanner scanner = new Scanner(System.in);
-        Manager manager = new Manager(scanner);
-        manager.start();
+        MainService mainService = new MainService(scanner);
+        mainService.start();
     }
 }
diff --git a/src/main/java/subway/Manager.java b/src/main/java/subway/Manager.java
deleted file mode 100644
index ebdfca559..000000000
--- a/src/main/java/subway/Manager.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package subway;
-
-import subway.constant.Information;
-import subway.exception.InvalidInputException;
-
-import java.util.Scanner;
-
-public class Manager {
-
-    private Scanner scanner;
-    private FunctionValidator functionValidator = new FunctionValidator();
-    private boolean isContinue = true;
-
-    public Manager(Scanner scanner) {
-        this.scanner = scanner;
-    }
-
-
-    public void start() {
-        initParams();
-        while (isContinue)
-            runFunction();
-    }
-
-    private void initParams() {
-        // TODO 노선도 초기화
-    }
-
-    private void runFunction() {
-        try {
-            String selectedFunction = selectFunction();
-        } catch (InvalidInputException e) {
-            System.out.println(e.getMessage());
-        }
-    }
-
-    private String selectFunction() throws InvalidInputException {
-        String line = getFunctionInput();
-        functionValidator.validate(line);
-        return line;
-    }
-
-    private String getFunctionInput() {
-        System.out.println(Information.MAIN_INFO);
-        return scanner.nextLine();
-    }
-}
diff --git a/src/main/java/subway/FunctionValidator.java b/src/main/java/subway/ServiceValidator.java
similarity index 69%
rename from src/main/java/subway/FunctionValidator.java
rename to src/main/java/subway/ServiceValidator.java
index 970908d6a..dc9e751fb 100644
--- a/src/main/java/subway/FunctionValidator.java
+++ b/src/main/java/subway/ServiceValidator.java
@@ -1,13 +1,13 @@
 package subway;
 
-import subway.constant.Function;
+import subway.constant.Service;
 import subway.exception.InvalidInputException;
 
 
-public class FunctionValidator {
+public class ServiceValidator {
 
     public void validate(String input) throws InvalidInputException {
-        if (!Function.isAvailable(input))
+        if (!Service.isAvailable(input))
             throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_FUNCTION_CODE);
     }
 }
diff --git a/src/main/java/subway/constant/Function.java b/src/main/java/subway/constant/Function.java
deleted file mode 100644
index 2beac2e3c..000000000
--- a/src/main/java/subway/constant/Function.java
+++ /dev/null
@@ -1,30 +0,0 @@
-package subway.constant;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public enum Function {
-
-    MANAGE_STATION("1"),
-    MANAGE_LINE("2"),
-    MANAGE_ROUTE("3"),
-    PRINT_MAP("4"),
-    QUIT("Q");
-
-    private static List<String> functionCodes = new ArrayList<>();
-    private String code;
-
-    Function(String code) {
-        this.code = code;
-    }
-
-    public static boolean isAvailable(String input) {
-        initFunctionValues();
-        return functionCodes.contains(input);
-    }
-
-    private static void initFunctionValues() {
-        for (Function function : Function.values())
-            functionCodes.add(function.code);
-    }
-}
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index cd2e684db..f6af28c3c 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -2,5 +2,11 @@
 
 public class Information {
 
-    public static final String MAIN_INFO = "\n## 메인 화면\n1. 역 관리\n2. 노선 관리\n3. 구간 관리\n4. 지하철 노선도 출력\nQ. 종료\n\n## 원하는 기능을 선택하세요.";
+    public static final String CHOOSE_FUNCTION = "\n## 원하는 기능을 선택하세요.";
+
+    public static final String MAIN_INFO = "\n## 메인 화면\n1. 역 관리\n2. 노선 관리\n3. 구간 관리\n4. 지하철 노선도 출력\nQ. 종료\n" + CHOOSE_FUNCTION;
+    public static final String STATION_INFO = "\n## 역 관리 화면\n1. 역 등록\n2. 역 삭제\n3. 역 조회\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String LINE_INFO = "\n## 노선 관리 화면\n1. 노선 등록\n2. 노선 삭제\n3. 노선 조회\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String AREA_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String MAP_INFO = "\n## 지하철 노선도";
 }
diff --git a/src/main/java/subway/constant/Service.java b/src/main/java/subway/constant/Service.java
new file mode 100644
index 000000000..c7ae24f19
--- /dev/null
+++ b/src/main/java/subway/constant/Service.java
@@ -0,0 +1,34 @@
+package subway.constant;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public enum Service {
+
+    STATION("1"),
+    LINE("2"),
+    AREA("3"),
+    MAP("4"),
+    QUIT("Q");
+
+    private static List<String> serviceCodes = new ArrayList<>();
+    private String code;
+
+    Service(String code) {
+        this.code = code;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public static boolean isAvailable(String input) {
+        initServiceCodes();
+        return serviceCodes.contains(input);
+    }
+
+    private static void initServiceCodes() {
+        for (Service service : Service.values())
+            serviceCodes.add(service.code);
+    }
+}
diff --git a/src/main/java/subway/domain/Map.java b/src/main/java/subway/domain/Map.java
new file mode 100644
index 000000000..dd8b09b49
--- /dev/null
+++ b/src/main/java/subway/domain/Map.java
@@ -0,0 +1,8 @@
+package subway.domain;
+
+public class Map {
+
+    public Map() {
+        // TODO 노선 초기화
+    }
+}
diff --git a/src/main/java/subway/service/AreaService.java b/src/main/java/subway/service/AreaService.java
new file mode 100644
index 000000000..13abc0363
--- /dev/null
+++ b/src/main/java/subway/service/AreaService.java
@@ -0,0 +1,18 @@
+package subway.service;
+
+import subway.constant.Information;
+
+import java.util.Scanner;
+
+public class AreaService {
+
+    private Scanner scanner;
+
+    public AreaService(Scanner scanner) {
+        this.scanner = scanner;
+    }
+
+    public void run() {
+        System.out.println(Information.AREA_INFO);
+    }
+}
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
new file mode 100644
index 000000000..621d911cb
--- /dev/null
+++ b/src/main/java/subway/service/LineService.java
@@ -0,0 +1,18 @@
+package subway.service;
+
+import subway.constant.Information;
+
+import java.util.Scanner;
+
+public class LineService {
+
+    private Scanner scanner;
+
+    public LineService(Scanner scanner) {
+        this.scanner = scanner;
+    }
+
+    public void run() {
+        System.out.println(Information.LINE_INFO);
+    }
+}
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
new file mode 100644
index 000000000..7aae480b2
--- /dev/null
+++ b/src/main/java/subway/service/MainService.java
@@ -0,0 +1,65 @@
+package subway.service;
+
+import subway.ServiceValidator;
+import subway.constant.Information;
+import subway.constant.Service;
+import subway.exception.InvalidInputException;
+
+import java.util.Scanner;
+
+public class MainService {
+
+    private Scanner scanner;
+    private ServiceValidator serviceValidator = new ServiceValidator();
+    private boolean isContinue = true;
+
+    private StationService stationService;
+    private LineService lineService;
+    private AreaService areaService;
+    private MapService mapService;
+
+    public MainService(Scanner scanner) {
+        this.scanner = scanner;
+        stationService = new StationService(scanner);
+        lineService = new LineService(scanner);
+        areaService = new AreaService(scanner);
+        mapService = new MapService();
+    }
+
+
+    public void start() {
+        while (isContinue)
+            runService();
+    }
+
+    private void runService() {
+        try {
+            String selectedService = selectService();
+            runSelectedService(selectedService);
+        } catch (InvalidInputException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private String selectService() {
+        String line = getServiceInput();
+        serviceValidator.validate(line);
+        return line;
+    }
+
+    private String getServiceInput() {
+        System.out.println(Information.MAIN_INFO);
+        return scanner.nextLine();
+    }
+
+    private void runSelectedService(String selectedFunction) {
+        if (selectedFunction.equals(Service.STATION.getCode()))
+            stationService.run();
+        if (selectedFunction.equals(Service.LINE.getCode()))
+            lineService.run();
+        if (selectedFunction.equals(Service.AREA.getCode()))
+            areaService.run();
+        if (selectedFunction.equals(Service.MAP.getCode()))
+            mapService.run();
+    }
+}
diff --git a/src/main/java/subway/service/MapService.java b/src/main/java/subway/service/MapService.java
new file mode 100644
index 000000000..3579db3da
--- /dev/null
+++ b/src/main/java/subway/service/MapService.java
@@ -0,0 +1,10 @@
+package subway.service;
+
+import subway.constant.Information;
+
+public class MapService {
+
+    public void run() {
+        System.out.println(Information.MAP_INFO);
+    }
+}
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
new file mode 100644
index 000000000..d22ca42ff
--- /dev/null
+++ b/src/main/java/subway/service/StationService.java
@@ -0,0 +1,18 @@
+package subway.service;
+
+import subway.constant.Information;
+
+import java.util.Scanner;
+
+public class StationService {
+
+    private Scanner scanner;
+
+    public StationService(Scanner scanner) {
+        this.scanner = scanner;
+    }
+
+    public void run() {
+        System.out.println(Information.STATION_INFO);
+    }
+}

From 30473334bee1587de4a878c99cf35a96371cd3e8 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 17:39:29 +0900
Subject: [PATCH 04/51] refactor: refactor package structure

---
 README.md                                                     | 4 ++--
 .../java/subway/{domain => repository}/LineRepository.java    | 4 +++-
 .../java/subway/{domain => repository}/StationRepository.java | 4 +++-
 src/main/java/subway/service/MainService.java                 | 4 +++-
 src/main/java/subway/{ => validator}/ServiceValidator.java    | 2 +-
 5 files changed, 12 insertions(+), 6 deletions(-)
 rename src/main/java/subway/{domain => repository}/LineRepository.java (90%)
 rename src/main/java/subway/{domain => repository}/StationRepository.java (90%)
 rename src/main/java/subway/{ => validator}/ServiceValidator.java (92%)

diff --git a/README.md b/README.md
index 68c645160..ea244ff05 100644
--- a/README.md
+++ b/README.md
@@ -473,7 +473,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 
 ## ☑ 구현할 기능 목록
 
-- [ ] 메인
+- [x] 메인
   - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다
   - [x] 사용자 입력에 따라 기능을 실행한다
-  - [ ] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
\ No newline at end of file
+  - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
\ No newline at end of file
diff --git a/src/main/java/subway/domain/LineRepository.java b/src/main/java/subway/repository/LineRepository.java
similarity index 90%
rename from src/main/java/subway/domain/LineRepository.java
rename to src/main/java/subway/repository/LineRepository.java
index 49132ddb6..2cf84c862 100644
--- a/src/main/java/subway/domain/LineRepository.java
+++ b/src/main/java/subway/repository/LineRepository.java
@@ -1,4 +1,6 @@
-package subway.domain;
+package subway.repository;
+
+import subway.domain.Line;
 
 import java.util.ArrayList;
 import java.util.Collections;
diff --git a/src/main/java/subway/domain/StationRepository.java b/src/main/java/subway/repository/StationRepository.java
similarity index 90%
rename from src/main/java/subway/domain/StationRepository.java
rename to src/main/java/subway/repository/StationRepository.java
index b7245c0f3..211b46558 100644
--- a/src/main/java/subway/domain/StationRepository.java
+++ b/src/main/java/subway/repository/StationRepository.java
@@ -1,4 +1,6 @@
-package subway.domain;
+package subway.repository;
+
+import subway.domain.Station;
 
 import java.util.ArrayList;
 import java.util.Collections;
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 7aae480b2..5fccae9cf 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -1,6 +1,6 @@
 package subway.service;
 
-import subway.ServiceValidator;
+import subway.validator.ServiceValidator;
 import subway.constant.Information;
 import subway.constant.Service;
 import subway.exception.InvalidInputException;
@@ -61,5 +61,7 @@ private void runSelectedService(String selectedFunction) {
             areaService.run();
         if (selectedFunction.equals(Service.MAP.getCode()))
             mapService.run();
+        if (selectedFunction.equals(Service.QUIT.getCode()))
+            isContinue = false;
     }
 }
diff --git a/src/main/java/subway/ServiceValidator.java b/src/main/java/subway/validator/ServiceValidator.java
similarity index 92%
rename from src/main/java/subway/ServiceValidator.java
rename to src/main/java/subway/validator/ServiceValidator.java
index dc9e751fb..d32be5722 100644
--- a/src/main/java/subway/ServiceValidator.java
+++ b/src/main/java/subway/validator/ServiceValidator.java
@@ -1,4 +1,4 @@
-package subway;
+package subway.validator;
 
 import subway.constant.Service;
 import subway.exception.InvalidInputException;

From b42a6410e90aefee515bbee2a0961dc2d5755903 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 19:29:42 +0900
Subject: [PATCH 05/51] feat(main): initialize map with given data

---
 README.md                                     |  3 +-
 .../java/subway/constant/InitialData.java     | 46 +++++++++++++++++++
 src/main/java/subway/domain/Line.java         | 14 ++++++
 src/main/java/subway/domain/Station.java      |  1 +
 .../subway/repository/LineRepository.java     |  5 ++
 .../subway/repository/StationRepository.java  |  5 ++
 src/main/java/subway/service/LineService.java |  7 +++
 .../java/subway/service/StationService.java   |  7 +++
 8 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/subway/constant/InitialData.java

diff --git a/README.md b/README.md
index ea244ff05..5132f9081 100644
--- a/README.md
+++ b/README.md
@@ -476,4 +476,5 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 - [x] 메인
   - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다
   - [x] 사용자 입력에 따라 기능을 실행한다
-  - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
\ No newline at end of file
+  - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
+  - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다
\ No newline at end of file
diff --git a/src/main/java/subway/constant/InitialData.java b/src/main/java/subway/constant/InitialData.java
new file mode 100644
index 000000000..af6efe715
--- /dev/null
+++ b/src/main/java/subway/constant/InitialData.java
@@ -0,0 +1,46 @@
+package subway.constant;
+
+import subway.domain.Line;
+import subway.domain.Station;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class InitialData {
+
+    public static final List<Station> stations = Arrays.asList(
+            new Station("교대역"),
+            new Station("강남역"),
+            new Station("역삼역"),
+            new Station("남부터미널역"),
+            new Station("양재역"),
+            new Station("양재시민의숲역"),
+            new Station("매봉역")
+    );
+
+
+    private static final List<Station> lineTwoStations = Arrays.asList(
+            new Station("교대역"),
+            new Station("강남역"),
+            new Station("역삼역")
+    );
+
+    private static final List<Station> lineThreeStations = Arrays.asList(
+            new Station("교대역"),
+            new Station("남부터미널역"),
+            new Station("양재역"),
+            new Station("매봉역")
+    );
+
+    private static final List<Station> lineSinbundangStations = Arrays.asList(
+            new Station("강남역"),
+            new Station("양재역"),
+            new Station("양재시민의숲역")
+    );
+
+    public static final List<Line> lines = Arrays.asList(
+            new Line("2호선", lineTwoStations),
+            new Line("3호선", lineThreeStations),
+            new Line("신분당선", lineSinbundangStations)
+    );
+}
diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index f4d738d5a..9c9d90f08 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -1,15 +1,29 @@
 package subway.domain;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class Line {
+
     private String name;
+    private List<Station> stations = new ArrayList<>();
 
     public Line(String name) {
         this.name = name;
     }
 
+    public Line(String name, List<Station> stations) {
+        this.name = name;
+        this.stations = stations;
+    }
+
     public String getName() {
         return name;
     }
 
+    public List<Station> getStations() {
+        return stations;
+    }
+
     // 추가 기능 구현
 }
diff --git a/src/main/java/subway/domain/Station.java b/src/main/java/subway/domain/Station.java
index bdb142590..4c75a8481 100644
--- a/src/main/java/subway/domain/Station.java
+++ b/src/main/java/subway/domain/Station.java
@@ -1,6 +1,7 @@
 package subway.domain;
 
 public class Station {
+
     private String name;
 
     public Station(String name) {
diff --git a/src/main/java/subway/repository/LineRepository.java b/src/main/java/subway/repository/LineRepository.java
index 2cf84c862..d4e37473d 100644
--- a/src/main/java/subway/repository/LineRepository.java
+++ b/src/main/java/subway/repository/LineRepository.java
@@ -18,6 +18,11 @@ public static void addLine(Line line) {
         lines.add(line);
     }
 
+    public static void addLine(List<Line> lines) {
+        for (Line line : lines)
+            addLine(line);
+    }
+
     public static boolean deleteLineByName(String name) {
         return lines.removeIf(line -> Objects.equals(line.getName(), name));
     }
diff --git a/src/main/java/subway/repository/StationRepository.java b/src/main/java/subway/repository/StationRepository.java
index 211b46558..067c33c2e 100644
--- a/src/main/java/subway/repository/StationRepository.java
+++ b/src/main/java/subway/repository/StationRepository.java
@@ -18,6 +18,11 @@ public static void addStation(Station station) {
         stations.add(station);
     }
 
+    public static void addStation(List<Station> stations) {
+        for (Station station : stations)
+            addStation(station);
+    }
+
     public static boolean deleteStation(String name) {
         return stations.removeIf(station -> Objects.equals(station.getName(), name));
     }
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index 621d911cb..e3d1dccbd 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -1,6 +1,8 @@
 package subway.service;
 
 import subway.constant.Information;
+import subway.constant.InitialData;
+import subway.repository.LineRepository;
 
 import java.util.Scanner;
 
@@ -10,6 +12,11 @@ public class LineService {
 
     public LineService(Scanner scanner) {
         this.scanner = scanner;
+        initLines();
+    }
+
+    private void initLines() {
+        LineRepository.addLine(InitialData.lines);
     }
 
     public void run() {
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index d22ca42ff..5ecae3ba0 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -1,6 +1,8 @@
 package subway.service;
 
 import subway.constant.Information;
+import subway.constant.InitialData;
+import subway.repository.StationRepository;
 
 import java.util.Scanner;
 
@@ -10,6 +12,11 @@ public class StationService {
 
     public StationService(Scanner scanner) {
         this.scanner = scanner;
+        initStations();
+    }
+
+    private void initStations() {
+        StationRepository.addStation(InitialData.stations);
     }
 
     public void run() {

From ff4656a2f1ca84d774acebb4b935878e55c1f5c1 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 19:34:48 +0900
Subject: [PATCH 06/51] docs(readme): update the list to implement station
 service

---
 README.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 5132f9081..3e379ab7a 100644
--- a/README.md
+++ b/README.md
@@ -477,4 +477,9 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
   - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다
   - [x] 사용자 입력에 따라 기능을 실행한다
   - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
-  - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다
\ No newline at end of file
+  - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다
+- [ ] 역 관리
+  - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
+  - [ ] 역 등록 시 이름 중복을 확인한다.
+  - [ ] 역 등록 시 이름이 2글자 이상인지 확인한다.
+  - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file

From e26b69057631969db3482cbbc8332b5515a9d1cc Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 19:43:54 +0900
Subject: [PATCH 07/51] docs(readme): update the list to implement station
 service

---
 README.md | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 5132f9081..b6f265ec8 100644
--- a/README.md
+++ b/README.md
@@ -474,7 +474,14 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 ## ☑ 구현할 기능 목록
 
 - [x] 메인
-  - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다
-  - [x] 사용자 입력에 따라 기능을 실행한다
-  - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다
-  - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다
\ No newline at end of file
+  - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+  - [x] 사용자 입력에 따라 하위 기능을 실행한다.
+  - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다.
+  - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다.
+- [ ] 역 관리
+  - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+  - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
+  - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
+  - [ ] 역 등록 시 이름 중복을 확인한다.
+  - [ ] 역 등록 시 이름이 2글자 이상인지 확인한다.
+  - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file

From 4493cd30866584f7c6a2f782c53b2115fd92cf14 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 19:49:05 +0900
Subject: [PATCH 08/51] refactor: rename function to service

---
 .../java/subway/exception/InvalidInputException.java |  4 ++--
 src/main/java/subway/service/MainService.java        | 12 ++++++------
 src/main/java/subway/validator/ServiceValidator.java |  2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 22b7094e3..05c1ff92a 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -3,7 +3,7 @@
 public class InvalidInputException extends RuntimeException {
 
     public enum ExceptionCode {
-        INVALID_FUNCTION_CODE
+        INVALID_SERVICE_CODE
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -15,7 +15,7 @@ public InvalidInputException(ExceptionCode exceptionCode) {
     }
 
     public String getMessage() {
-        if (exceptionCode.equals(ExceptionCode.INVALID_FUNCTION_CODE))
+        if (exceptionCode.equals(ExceptionCode.INVALID_SERVICE_CODE))
             return HEADER + "선택할 수 없는 기능입니다.";
         return "";
     }
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 5fccae9cf..5f5d82b16 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -52,16 +52,16 @@ private String getServiceInput() {
         return scanner.nextLine();
     }
 
-    private void runSelectedService(String selectedFunction) {
-        if (selectedFunction.equals(Service.STATION.getCode()))
+    private void runSelectedService(String selectedService) {
+        if (selectedService.equals(Service.STATION.getCode()))
             stationService.run();
-        if (selectedFunction.equals(Service.LINE.getCode()))
+        if (selectedService.equals(Service.LINE.getCode()))
             lineService.run();
-        if (selectedFunction.equals(Service.AREA.getCode()))
+        if (selectedService.equals(Service.AREA.getCode()))
             areaService.run();
-        if (selectedFunction.equals(Service.MAP.getCode()))
+        if (selectedService.equals(Service.MAP.getCode()))
             mapService.run();
-        if (selectedFunction.equals(Service.QUIT.getCode()))
+        if (selectedService.equals(Service.QUIT.getCode()))
             isContinue = false;
     }
 }
diff --git a/src/main/java/subway/validator/ServiceValidator.java b/src/main/java/subway/validator/ServiceValidator.java
index d32be5722..a97b0d9d0 100644
--- a/src/main/java/subway/validator/ServiceValidator.java
+++ b/src/main/java/subway/validator/ServiceValidator.java
@@ -8,6 +8,6 @@ public class ServiceValidator {
 
     public void validate(String input) throws InvalidInputException {
         if (!Service.isAvailable(input))
-            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_FUNCTION_CODE);
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_SERVICE_CODE);
     }
 }

From 7e84642d36fba9d4951264eaa895ad7b8fbf7d4f Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 20:00:27 +0900
Subject: [PATCH 09/51] refactor: move validation method into service

---
 src/main/java/subway/constant/Service.java          |  9 ++++++++-
 .../java/subway/validator/ServiceValidator.java     | 13 -------------
 2 files changed, 8 insertions(+), 14 deletions(-)
 delete mode 100644 src/main/java/subway/validator/ServiceValidator.java

diff --git a/src/main/java/subway/constant/Service.java b/src/main/java/subway/constant/Service.java
index c7ae24f19..835acdd75 100644
--- a/src/main/java/subway/constant/Service.java
+++ b/src/main/java/subway/constant/Service.java
@@ -1,5 +1,7 @@
 package subway.constant;
 
+import subway.exception.InvalidInputException;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -22,7 +24,12 @@ public String getCode() {
         return code;
     }
 
-    public static boolean isAvailable(String input) {
+    public static void validate(String input) throws InvalidInputException {
+        if (!isAvailable(input))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_SERVICE_CODE);
+    }
+
+    private static boolean isAvailable(String input) {
         initServiceCodes();
         return serviceCodes.contains(input);
     }
diff --git a/src/main/java/subway/validator/ServiceValidator.java b/src/main/java/subway/validator/ServiceValidator.java
deleted file mode 100644
index a97b0d9d0..000000000
--- a/src/main/java/subway/validator/ServiceValidator.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package subway.validator;
-
-import subway.constant.Service;
-import subway.exception.InvalidInputException;
-
-
-public class ServiceValidator {
-
-    public void validate(String input) throws InvalidInputException {
-        if (!Service.isAvailable(input))
-            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_SERVICE_CODE);
-    }
-}

From 7bce4ef80db7daad7a5638550640bd9574c38a84 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 20:01:22 +0900
Subject: [PATCH 10/51] feat(station): implement select function and validation
 input

---
 README.md                                     |  2 +-
 src/main/java/subway/constant/Function.java   | 40 +++++++++++++++++++
 .../exception/InvalidInputException.java      |  5 ++-
 src/main/java/subway/service/MainService.java |  4 +-
 .../java/subway/service/StationService.java   | 22 ++++++++++
 5 files changed, 67 insertions(+), 6 deletions(-)
 create mode 100644 src/main/java/subway/constant/Function.java

diff --git a/README.md b/README.md
index b6f265ec8..c74661ed5 100644
--- a/README.md
+++ b/README.md
@@ -479,7 +479,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
   - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다.
   - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다.
 - [ ] 역 관리
-  - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+  - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
   - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
   - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
   - [ ] 역 등록 시 이름 중복을 확인한다.
diff --git a/src/main/java/subway/constant/Function.java b/src/main/java/subway/constant/Function.java
new file mode 100644
index 000000000..cbb64da50
--- /dev/null
+++ b/src/main/java/subway/constant/Function.java
@@ -0,0 +1,40 @@
+package subway.constant;
+
+import subway.exception.InvalidInputException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public enum Function {
+
+    ADD("1"),
+    DELETE("2"),
+    SHOW("3"),
+    QUIT("B");
+
+    private static List<String> functionCodes = new ArrayList<>();
+    private String code;
+
+    Function(String code) {
+        this.code = code;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public static void validate(String input) throws InvalidInputException {
+        if (!isAvailable(input))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_FUNCTION_CODE);
+    }
+
+    private static boolean isAvailable(String input) {
+        initFunctionCodes();
+        return functionCodes.contains(input);
+    }
+
+    private static void initFunctionCodes() {
+        for (Function function : Function.values())
+            functionCodes.add(function.code);
+    }
+}
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 05c1ff92a..5a90caa82 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -3,7 +3,8 @@
 public class InvalidInputException extends RuntimeException {
 
     public enum ExceptionCode {
-        INVALID_SERVICE_CODE
+        INVALID_SERVICE_CODE,
+        INVALID_FUNCTION_CODE;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -15,7 +16,7 @@ public InvalidInputException(ExceptionCode exceptionCode) {
     }
 
     public String getMessage() {
-        if (exceptionCode.equals(ExceptionCode.INVALID_SERVICE_CODE))
+        if (exceptionCode.equals(ExceptionCode.INVALID_SERVICE_CODE) || exceptionCode.equals(ExceptionCode.INVALID_FUNCTION_CODE))
             return HEADER + "선택할 수 없는 기능입니다.";
         return "";
     }
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 5f5d82b16..bb5d423e8 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -1,6 +1,5 @@
 package subway.service;
 
-import subway.validator.ServiceValidator;
 import subway.constant.Information;
 import subway.constant.Service;
 import subway.exception.InvalidInputException;
@@ -10,7 +9,6 @@
 public class MainService {
 
     private Scanner scanner;
-    private ServiceValidator serviceValidator = new ServiceValidator();
     private boolean isContinue = true;
 
     private StationService stationService;
@@ -43,7 +41,7 @@ private void runService() {
 
     private String selectService() {
         String line = getServiceInput();
-        serviceValidator.validate(line);
+        Service.validate(line);
         return line;
     }
 
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 5ecae3ba0..409d21a11 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -1,7 +1,9 @@
 package subway.service;
 
+import subway.constant.Function;
 import subway.constant.Information;
 import subway.constant.InitialData;
+import subway.exception.InvalidInputException;
 import subway.repository.StationRepository;
 
 import java.util.Scanner;
@@ -20,6 +22,26 @@ private void initStations() {
     }
 
     public void run() {
+        try {
+            String selectedFunction = selectFunction();
+            runSelectedFunction(selectedFunction);
+        } catch (InvalidInputException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private String selectFunction() {
+        String line = getFunctionInput();
+        Function.validate(line);
+        return line;
+    }
+
+    private String getFunctionInput() {
         System.out.println(Information.STATION_INFO);
+        return scanner.nextLine();
+    }
+
+    private void runSelectedFunction(String selectedFunction) {
+        System.out.println("선택된 기능: "+selectedFunction);
     }
 }

From 56ae11b1115abe97429266a7cc33290a6702e79c Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 20:15:02 +0900
Subject: [PATCH 11/51] feat(station): implement run function on user input

---
 README.md                                     |  2 +-
 .../java/subway/constant/Information.java     | 12 +++++++++++-
 .../exception/InvalidInputException.java      |  3 ++-
 .../java/subway/service/StationService.java   | 19 ++++++++++++++++++-
 4 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index c74661ed5..f82b816f0 100644
--- a/README.md
+++ b/README.md
@@ -480,7 +480,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
   - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다.
 - [ ] 역 관리
   - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
-  - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
+  - [x] 사용자 입력에 따라 하위 기능을 실행한다.
   - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
   - [ ] 역 등록 시 이름 중복을 확인한다.
   - [ ] 역 등록 시 이름이 2글자 이상인지 확인한다.
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index f6af28c3c..5de82f547 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -2,11 +2,21 @@
 
 public class Information {
 
-    public static final String CHOOSE_FUNCTION = "\n## 원하는 기능을 선택하세요.";
+    public static final String INFO_HEADER = "\n[INFO] ";
 
+    public static final String CHOOSE_FUNCTION = "\n## 원하는 기능을 선택하세요.";
     public static final String MAIN_INFO = "\n## 메인 화면\n1. 역 관리\n2. 노선 관리\n3. 구간 관리\n4. 지하철 노선도 출력\nQ. 종료\n" + CHOOSE_FUNCTION;
+
     public static final String STATION_INFO = "\n## 역 관리 화면\n1. 역 등록\n2. 역 삭제\n3. 역 조회\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String ADD_STATION_INFO = "\n## 등록할 역 이름을 입력하세요.";
+    public static final String ADD_STATION_SUCCESS = INFO_HEADER + "지하철 역이 등록되었습니다.";
+    public static final String DELETE_STATION_INFO = "\n## 삭제할 역 이름을 입력하세요.";
+    public static final String DELETE_STATION_SUCCESS = INFO_HEADER + "지하철 역이 삭제되었습니다.";
+    public static final String SHOW_STATION_INFO = "\n## 역 목록";
+
     public static final String LINE_INFO = "\n## 노선 관리 화면\n1. 노선 등록\n2. 노선 삭제\n3. 노선 조회\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+
     public static final String AREA_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+
     public static final String MAP_INFO = "\n## 지하철 노선도";
 }
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 5a90caa82..d1282bb39 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -4,7 +4,8 @@ public class InvalidInputException extends RuntimeException {
 
     public enum ExceptionCode {
         INVALID_SERVICE_CODE,
-        INVALID_FUNCTION_CODE;
+        INVALID_FUNCTION_CODE,
+        DUPLICATE_STATION_CODE;
     }
 
     private final String HEADER = "\n[ERROR] ";
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 409d21a11..3c0f575cf 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -42,6 +42,23 @@ private String getFunctionInput() {
     }
 
     private void runSelectedFunction(String selectedFunction) {
-        System.out.println("선택된 기능: "+selectedFunction);
+        if (selectedFunction.equals(Function.ADD.getCode()))
+            addNewStation();
+        if (selectedFunction.equals(Function.DELETE.getCode()))
+            deleteStation();
+        if (selectedFunction.equals(Function.SHOW.getCode()))
+            showStations();
+    }
+
+    private void addNewStation() {
+        System.out.println(Information.ADD_STATION_INFO);
+    }
+
+    private void deleteStation() {
+        System.out.println(Information.DELETE_STATION_INFO);
+    }
+
+    private void showStations() {
+        System.out.println(Information.SHOW_STATION_INFO);
     }
 }

From 0c7ac5c7df11f6834d090c4a8ea174d4ca5582f0 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 20:26:46 +0900
Subject: [PATCH 12/51] feat(station): check duplicated name on add

---
 README.md                                      |  2 +-
 src/main/java/subway/domain/Station.java       | 15 ++++++++++++++-
 .../exception/InvalidInputException.java       |  2 ++
 .../java/subway/service/StationService.java    | 18 ++++++++++++++++++
 4 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index f82b816f0..4b646e2a4 100644
--- a/README.md
+++ b/README.md
@@ -482,6 +482,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
   - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
   - [x] 사용자 입력에 따라 하위 기능을 실행한다.
   - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
-  - [ ] 역 등록 시 이름 중복을 확인한다.
+  - [x] 역 등록 시 이름 중복을 확인한다.
   - [ ] 역 등록 시 이름이 2글자 이상인지 확인한다.
   - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file
diff --git a/src/main/java/subway/domain/Station.java b/src/main/java/subway/domain/Station.java
index 4c75a8481..a572ebe5c 100644
--- a/src/main/java/subway/domain/Station.java
+++ b/src/main/java/subway/domain/Station.java
@@ -1,5 +1,7 @@
 package subway.domain;
 
+import java.util.Objects;
+
 public class Station {
 
     private String name;
@@ -12,5 +14,16 @@ public String getName() {
         return name;
     }
 
-    // 추가 기능 구현
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Station)) return false;
+        Station station = (Station) o;
+        return Objects.equals(name, station.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
 }
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index d1282bb39..0dd061387 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -19,6 +19,8 @@ public InvalidInputException(ExceptionCode exceptionCode) {
     public String getMessage() {
         if (exceptionCode.equals(ExceptionCode.INVALID_SERVICE_CODE) || exceptionCode.equals(ExceptionCode.INVALID_FUNCTION_CODE))
             return HEADER + "선택할 수 없는 기능입니다.";
+        if (exceptionCode.equals(ExceptionCode.DUPLICATE_STATION_CODE))
+            return HEADER + "이미 등록된 역 이름입니다.";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 3c0f575cf..e9ba87542 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -3,6 +3,7 @@
 import subway.constant.Function;
 import subway.constant.Information;
 import subway.constant.InitialData;
+import subway.domain.Station;
 import subway.exception.InvalidInputException;
 import subway.repository.StationRepository;
 
@@ -51,7 +52,24 @@ private void runSelectedFunction(String selectedFunction) {
     }
 
     private void addNewStation() {
+        Station newStation = getNewStationInput();
+        validateNewStation(newStation);
+        StationRepository.addStation(newStation);
+        System.out.println(Information.ADD_STATION_SUCCESS);
+    }
+
+    private Station getNewStationInput() {
         System.out.println(Information.ADD_STATION_INFO);
+        return new Station(scanner.nextLine());
+    }
+
+    private void validateNewStation(Station newStation) {
+        validateDuplicateStation(newStation);
+    }
+
+    private void validateDuplicateStation(Station newStation) {
+        if (StationRepository.stations().contains(newStation))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_STATION_CODE);
     }
 
     private void deleteStation() {

From 47b853ab2481cb7bebf8ef9ee1af0b68ad8f1a17 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 20:32:04 +0900
Subject: [PATCH 13/51] feat(station): validate station name length on add

---
 README.md                                     | 75 ++++++++++++-------
 src/main/java/subway/constant/Constant.java   |  6 ++
 .../exception/InvalidInputException.java      |  7 +-
 .../java/subway/service/StationService.java   |  9 ++-
 4 files changed, 66 insertions(+), 31 deletions(-)
 create mode 100644 src/main/java/subway/constant/Constant.java

diff --git a/README.md b/README.md
index 4b646e2a4..7e8ccff9b 100644
--- a/README.md
+++ b/README.md
@@ -1,15 +1,18 @@
 # 지하철 노선도 미션
+
 - 지하철 역과 노선을 관리하는 지하철 노선도 기능을 구현한다.
 
 <br>
 
 ## 🚀 기능 요구사항
 
-### 초기 설정 
+### 초기 설정
+
 - 프로그램 시작 시 역, 노선 등 필요한 정보를 미리 셋팅할 수 있다.
 
 > 아래의 사전 등록 정보로 반드시 초기 설정을 하기
 >
+
 ```
  1. 지하철역으로 교대역, 강남역, 역삼역, 남부터미널역, 양재역, 양재시민의숲역, 매봉역이 등록되어 있다.
  2. 지하철 노선으로 2호선, 3호선, 신분당선이 등록되어 있다.
@@ -20,23 +23,26 @@
  ```
 
 <img src="image/domain.png" width="500">
-  
+
 ### 지하철 역 관련 기능
+
 - 지하철 역을 등록하고 삭제할 수 있다. (단, 노선에 등록된 역은 삭제할 수 없다)
 - 중복된 지하철 역 이름이 등록될 수 없다.
 - 지하철 역 이름은 2글자 이상이어야 한다.
 - 지하철 역의 목록을 조회할 수 있다.
 
 ### 지하철 노선 관련 기능
+
 - 지하철 노선을 등록하고 삭제할 수 있다.
 - 중복된 지하철 노선 이름이 등록될 수 없다.
 - 지하철 노선 이름은 2글자 이상이어야 한다.
-- 노선 등록 시 상행 종점역과 하행 종점역을 입력받는다. 
+- 노선 등록 시 상행 종점역과 하행 종점역을 입력받는다.
 - 지하철 노선의 목록을 조회할 수 있다.
 
 ### 지하철 구간 추가 기능
+
 - 지하철 노선에 구간을 추가하는 기능은 노선에 역을 추가하는 기능이라고도 할 수 있다.
-  - 역과 역사이를 구간이라 하고 이 구간들의 모음이 노선이다.  
+    - 역과 역사이를 구간이라 하고 이 구간들의 모음이 노선이다.
 - 하나의 역은 여러개의 노선에 추가될 수 있다.
 - 역과 역 사이에 새로운 역이 추가 될 수 있다.
 - 노선에서 갈래길은 생길 수 없다.
@@ -44,6 +50,7 @@
 <img src="image/section1.png" width="500">
 
 ### 지하철 구간 삭제 기능
+
 - 노선에 등록된 역을 제거할 수 있다.
 - 종점을 제거할 경우 다음 역이 종점이 된다.
 - 노선에 포함된 역이 두개 이하일 때는 역을 제거할 수 없다.
@@ -51,17 +58,21 @@
 <img src="image/section2.png" width="500">
 
 ### 지하철 노선에 등록된 역 조회 기능
+
 - 노선의 상행 종점부터 하행 종점까지 연결된 순서대로 역 목록을 조회할 수 있다.
 
 <br>
 
 ## ✍🏻 입출력 요구사항
+
 - `프로그래밍 실행 결과 예시`를 참고하여 입출력을 구현한다.
 - 기대하는 출력 결과는 `[INFO]`를 붙여서 출력한다. 출력값의 형식은 예시와 동일하게 한다.
 - 에러 발생 시 `[ERROR]`를 붙여서 출력한다. (에러의 문구는 자유롭게 작성한다.)
 
-### 💻 프로그래밍 실행 결과 
+### 💻 프로그래밍 실행 결과
+
 #### 역 관리
+
 ```
 ## 메인 화면
 1. 역 관리
@@ -233,6 +244,7 @@ B. 돌아가기
 ```
 
 ### 구간 관리
+
 - 순서는 1부터 시작한다.
 
 ```
@@ -379,25 +391,28 @@ B. 돌아가기
 <br>
 
 ## 🎱 프로그래밍 요구사항
+
 - 자바 코드 컨벤션을 지키면서 프로그래밍한다.
-  - 기본적으로 [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)을 원칙으로 한다.
-  - 단, 들여쓰기는 '2 spaces'가 아닌 '4 spaces'로 한다.
+    - 기본적으로 [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)을 원칙으로 한다.
+    - 단, 들여쓰기는 '2 spaces'가 아닌 '4 spaces'로 한다.
 - indent(인덴트, 들여쓰기) depth를 3이 넘지 않도록 구현한다. 2까지만 허용한다.
-  - 예를 들어 while문 안에 if문이 있으면 들여쓰기는 2이다.
-  - 힌트: indent(인덴트, 들여쓰기) depth를 줄이는 좋은 방법은 함수(또는 메소드)를 분리하면 된다.
+    - 예를 들어 while문 안에 if문이 있으면 들여쓰기는 2이다.
+    - 힌트: indent(인덴트, 들여쓰기) depth를 줄이는 좋은 방법은 함수(또는 메소드)를 분리하면 된다.
 - 3항 연산자를 쓰지 않는다.
 - 함수(또는 메소드)의 길이가 15라인을 넘어가지 않도록 구현한다.
-  - 함수(또는 메소드)가 한 가지 일만 잘 하도록 구현한다.
+    - 함수(또는 메소드)가 한 가지 일만 잘 하도록 구현한다.
 - else 예약어를 쓰지 않는다.
-  - 힌트: if 조건절에서 값을 return하는 방식으로 구현하면 else를 사용하지 않아도 된다.
-  - else를 쓰지 말라고 하니 switch/case로 구현하는 경우가 있는데 switch/case도 허용하지 않는다.
+    - 힌트: if 조건절에서 값을 return하는 방식으로 구현하면 else를 사용하지 않아도 된다.
+    - else를 쓰지 말라고 하니 switch/case로 구현하는 경우가 있는데 switch/case도 허용하지 않는다.
 - 프로그래밍 요구사항에서 별도로 변경 불가 안내가 없는 경우 파일 수정과 패키지 이동을 자유롭게 할 수 있다.
 - 예외 상황 시 에러 문구를 출력해야 한다. 단, 에러 문구는 `[ERROR]` 로 시작해야 한다.
 
 ### 프로그래밍 요구사항 - Application
+
 - Application 클래스를 활용해 구현해야 한다.
 - Application의 패키지 구조는 변경하지 않는다.
-- 주석을 참고하여 구현할 수 있으며 주석대로 구현하지 않아도 되고 삭제해도 무관하다. 
+- 주석을 참고하여 구현할 수 있으며 주석대로 구현하지 않아도 되고 삭제해도 무관하다.
+
 ```java
 public class Application {
     public static void main(String[] args) {
@@ -407,11 +422,12 @@ public class Application {
 ```
 
 ### 프로그래밍 요구사항 - Station, Line
+
 - Station, Line 클래스를 활용하여 지하철역과 노선을 구현해야 한다.
 - 제공하는 각 클래스의 기본 생성자를 추가할 수 없다.
 - 필드(인스턴스 변수)인 name의 접근 제어자 private을 변경할 수 없다.
 - 가능하면 setter 메소드(ex. setXXX)를 추가하지 않고 구현한다.
- 
+
 ```java
 public class Station {
     private String name;
@@ -430,12 +446,13 @@ public class Station {
 ```
 
 ### 프로그래밍 요구사항 - StationRepository, LineRepository
+
 - Station과 Line의 상태를 저장할 수 있는 StationRepository, LineRepository를 제공한다.
 - 필요 시 StationRepository, LineRepository 이 외 추가로 Repository를 만들 수 있다.
 - 추가로 생성되는 객체에 대해서 XXXRepository 네이밍으로 저장 클래스를 추가할 수 있다.
 - 객체들의 상태를 관리하기 위해서 XXXRepository 클래스를 활용해 저장 로직을 구현해야 한다.
 - 필요에 따라 자유롭게 수정이 가능하다.
- 
+
 ```java
 public class StationRepository {
     private static final List<Station> stations = new ArrayList<>();
@@ -457,13 +474,15 @@ public class StationRepository {
 <br>
 
 ## 📈 진행 요구사항
+
 - 미션은 [java-subway-map-precourse 저장소](https://github.com/woowacourse/java-subway-map-precourse) 를 fork/clone해 시작한다.
 - 기능을 구현하기 전에 java-subway-map-precourse/docs/README.md 파일에 구현할 기능 목록을 정리해 추가한다.
 - git의 commit 단위는 앞 단계에서 README.md 파일에 정리한 기능 목록 단위로 추가한다.
-  - [AngularJS Commit Message Conventions](https://gist.github.com/stephenparish/9941e89d80e2bc58a153) 참고해 commit log를 남긴다.
+    - [AngularJS Commit Message Conventions](https://gist.github.com/stephenparish/9941e89d80e2bc58a153) 참고해 commit log를
+      남긴다.
 - [프리코스 과제 제출 문서](https://github.com/woowacourse/woowacourse-docs/tree/master/precourse) 절차를 따라 미션을 제출한다.
-  - [프리코스 과제 FAQ](https://github.com/woowacourse/woowacourse-docs/tree/master/precourse/faq) 문서를 참고하여 진행할 수 있다.
-<br>
+    - [프리코스 과제 FAQ](https://github.com/woowacourse/woowacourse-docs/tree/master/precourse/faq) 문서를 참고하여 진행할 수 있다.
+      <br>
 
 ## 📝 License
 
@@ -474,14 +493,14 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 ## ☑ 구현할 기능 목록
 
 - [x] 메인
-  - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
-  - [x] 사용자 입력에 따라 하위 기능을 실행한다.
-  - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다.
-  - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다.
+    - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+    - [x] 사용자 입력에 따라 하위 기능을 실행한다.
+    - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다.
+    - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다.
 - [ ] 역 관리
-  - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
-  - [x] 사용자 입력에 따라 하위 기능을 실행한다.
-  - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
-  - [x] 역 등록 시 이름 중복을 확인한다.
-  - [ ] 역 등록 시 이름이 2글자 이상인지 확인한다.
-  - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file
+    - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+    - [x] 사용자 입력에 따라 하위 기능을 실행한다.
+    - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
+    - [x] 역 등록 시 이름 중복을 확인한다.
+    - [x] 역 등록 시 이름이 2글자 이상인지 확인한다.
+    - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file
diff --git a/src/main/java/subway/constant/Constant.java b/src/main/java/subway/constant/Constant.java
new file mode 100644
index 000000000..4f47915b2
--- /dev/null
+++ b/src/main/java/subway/constant/Constant.java
@@ -0,0 +1,6 @@
+package subway.constant;
+
+public class Constant {
+
+    public static final int MIN_NAME_LENGTH = 2;
+}
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 0dd061387..1620bb821 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -5,7 +5,8 @@ public class InvalidInputException extends RuntimeException {
     public enum ExceptionCode {
         INVALID_SERVICE_CODE,
         INVALID_FUNCTION_CODE,
-        DUPLICATE_STATION_CODE;
+        DUPLICATE_STATION,
+        INVALID_NAME_LENGTH;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -19,8 +20,10 @@ public InvalidInputException(ExceptionCode exceptionCode) {
     public String getMessage() {
         if (exceptionCode.equals(ExceptionCode.INVALID_SERVICE_CODE) || exceptionCode.equals(ExceptionCode.INVALID_FUNCTION_CODE))
             return HEADER + "선택할 수 없는 기능입니다.";
-        if (exceptionCode.equals(ExceptionCode.DUPLICATE_STATION_CODE))
+        if (exceptionCode.equals(ExceptionCode.DUPLICATE_STATION))
             return HEADER + "이미 등록된 역 이름입니다.";
+        if (exceptionCode.equals(ExceptionCode.INVALID_NAME_LENGTH))
+            return HEADER + "이름은 두 글자 이상이어야 합니다.";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index e9ba87542..c0019675c 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -1,5 +1,6 @@
 package subway.service;
 
+import subway.constant.Constant;
 import subway.constant.Function;
 import subway.constant.Information;
 import subway.constant.InitialData;
@@ -64,12 +65,18 @@ private Station getNewStationInput() {
     }
 
     private void validateNewStation(Station newStation) {
+        validateNameLength(newStation);
         validateDuplicateStation(newStation);
     }
 
+    private void validateNameLength(Station newStation) {
+        if (newStation.getName().length() < Constant.MIN_NAME_LENGTH)
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_NAME_LENGTH);
+    }
+
     private void validateDuplicateStation(Station newStation) {
         if (StationRepository.stations().contains(newStation))
-            throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_STATION_CODE);
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_STATION);
     }
 
     private void deleteStation() {

From 377eeb7581d044dd52552dfe95c1341c39f027bf Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 20:35:51 +0900
Subject: [PATCH 14/51] feat(station): show all stations' name

---
 README.md                                        | 2 +-
 src/main/java/subway/service/StationService.java | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 7e8ccff9b..fb13a3ffd 100644
--- a/README.md
+++ b/README.md
@@ -500,7 +500,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 - [ ] 역 관리
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
-    - [ ] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
+    - [x] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
     - [x] 역 등록 시 이름 중복을 확인한다.
     - [x] 역 등록 시 이름이 2글자 이상인지 확인한다.
     - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index c0019675c..853f55643 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -10,6 +10,8 @@
 
 import java.util.Scanner;
 
+import static subway.constant.Information.INFO_HEADER;
+
 public class StationService {
 
     private Scanner scanner;
@@ -84,6 +86,9 @@ private void deleteStation() {
     }
 
     private void showStations() {
-        System.out.println(Information.SHOW_STATION_INFO);
+        System.out.print(Information.SHOW_STATION_INFO);
+        for (Station station : StationRepository.stations())
+            System.out.print(INFO_HEADER + station.getName());
+        System.out.println();
     }
 }

From 8266594867b006a7feb803842419a53e677fab35 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 21:03:54 +0900
Subject: [PATCH 15/51] docs(readme): update the list to implement line

---
 README.md | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index fb13a3ffd..7dc2ce4ab 100644
--- a/README.md
+++ b/README.md
@@ -503,4 +503,13 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
     - [x] 역 등록 시 이름 중복을 확인한다.
     - [x] 역 등록 시 이름이 2글자 이상인지 확인한다.
-    - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
\ No newline at end of file
+    - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
+- [ ] 노선 관리
+    - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+    - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
+    - [ ] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
+    - [ ] 노선 등록 시 이름 중복을 확인한다.
+    - [ ] 노선 등록 시 이름이 2글자 이상인지 확인한다.
+    - [ ] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
+    - [ ] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
+    - [ ] 노선 삭제 시 존재하는 노선인지 확인한다.
\ No newline at end of file

From c96a22359b2f3229250da31f00100fb8609c59f6 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 21:36:16 +0900
Subject: [PATCH 16/51] refactor: make service abstract

---
 src/main/java/subway/service/BaseService.java | 56 +++++++++++++++++++
 src/main/java/subway/service/Service.java     | 13 +++++
 .../java/subway/service/StationService.java   | 43 ++++----------
 3 files changed, 79 insertions(+), 33 deletions(-)
 create mode 100644 src/main/java/subway/service/BaseService.java
 create mode 100644 src/main/java/subway/service/Service.java

diff --git a/src/main/java/subway/service/BaseService.java b/src/main/java/subway/service/BaseService.java
new file mode 100644
index 000000000..c9c878c46
--- /dev/null
+++ b/src/main/java/subway/service/BaseService.java
@@ -0,0 +1,56 @@
+package subway.service;
+
+import subway.constant.Function;
+import subway.exception.InvalidInputException;
+
+import java.util.Scanner;
+
+public abstract class BaseService implements Service {
+
+    private Scanner scanner;
+    private String info;
+
+    public BaseService(Scanner scanner, String info) {
+        this.scanner = scanner;
+        this.info = info;
+    }
+
+    @Override
+    public void run() {
+        try {
+            String selectedFunction = selectFunction();
+            runSelectedFunction(selectedFunction);
+        } catch (InvalidInputException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private String selectFunction() {
+        String line = getFunctionInput();
+        Function.validate(line);
+        return line;
+    }
+
+    private String getFunctionInput() {
+        System.out.println(info);
+        return scanner.nextLine();
+    }
+
+    private void runSelectedFunction(String selectedFunction) {
+        if (selectedFunction.equals(Function.ADD.getCode()))
+            add();
+        if (selectedFunction.equals(Function.DELETE.getCode()))
+            delete();
+        if (selectedFunction.equals(Function.SHOW.getCode()))
+            show();
+    }
+
+    @Override
+    public abstract void add();
+
+    @Override
+    public abstract void delete();
+
+    @Override
+    public abstract void show();
+}
diff --git a/src/main/java/subway/service/Service.java b/src/main/java/subway/service/Service.java
new file mode 100644
index 000000000..4df566bfd
--- /dev/null
+++ b/src/main/java/subway/service/Service.java
@@ -0,0 +1,13 @@
+package subway.service;
+
+public interface Service {
+
+    void run();
+
+    void add();
+
+    void delete();
+
+    void show();
+
+}
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 853f55643..d1617ca7e 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -1,7 +1,6 @@
 package subway.service;
 
 import subway.constant.Constant;
-import subway.constant.Function;
 import subway.constant.Information;
 import subway.constant.InitialData;
 import subway.domain.Station;
@@ -12,11 +11,12 @@
 
 import static subway.constant.Information.INFO_HEADER;
 
-public class StationService {
+public class StationService extends BaseService {
 
     private Scanner scanner;
 
     public StationService(Scanner scanner) {
+        super(scanner, Information.STATION_INFO);
         this.scanner = scanner;
         initStations();
     }
@@ -25,36 +25,9 @@ private void initStations() {
         StationRepository.addStation(InitialData.stations);
     }
 
-    public void run() {
-        try {
-            String selectedFunction = selectFunction();
-            runSelectedFunction(selectedFunction);
-        } catch (InvalidInputException e) {
-            System.out.println(e.getMessage());
-        }
-    }
-
-    private String selectFunction() {
-        String line = getFunctionInput();
-        Function.validate(line);
-        return line;
-    }
-
-    private String getFunctionInput() {
-        System.out.println(Information.STATION_INFO);
-        return scanner.nextLine();
-    }
 
-    private void runSelectedFunction(String selectedFunction) {
-        if (selectedFunction.equals(Function.ADD.getCode()))
-            addNewStation();
-        if (selectedFunction.equals(Function.DELETE.getCode()))
-            deleteStation();
-        if (selectedFunction.equals(Function.SHOW.getCode()))
-            showStations();
-    }
-
-    private void addNewStation() {
+    @Override
+    public void add() {
         Station newStation = getNewStationInput();
         validateNewStation(newStation);
         StationRepository.addStation(newStation);
@@ -81,11 +54,15 @@ private void validateDuplicateStation(Station newStation) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_STATION);
     }
 
-    private void deleteStation() {
+
+    @Override
+    public void delete() {
         System.out.println(Information.DELETE_STATION_INFO);
     }
 
-    private void showStations() {
+
+    @Override
+    public void show() {
         System.out.print(Information.SHOW_STATION_INFO);
         for (Station station : StationRepository.stations())
             System.out.print(INFO_HEADER + station.getName());

From 2204c02d398057d979b0dd65e2e96e6c63db1393 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 21:43:16 +0900
Subject: [PATCH 17/51] feat(line): implement select function and validate
 input

---
 README.md                                     |  3 +--
 .../java/subway/constant/Information.java     |  6 ++++++
 src/main/java/subway/service/LineService.java | 19 ++++++++++++++++---
 3 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 7dc2ce4ab..dd6056f49 100644
--- a/README.md
+++ b/README.md
@@ -505,8 +505,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 역 등록 시 이름이 2글자 이상인지 확인한다.
     - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
 - [ ] 노선 관리
-    - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다.
-    - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
+    - [x] 하위 기능을 선택한다. (역 관리와 동일)
     - [ ] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
     - [ ] 노선 등록 시 이름 중복을 확인한다.
     - [ ] 노선 등록 시 이름이 2글자 이상인지 확인한다.
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index 5de82f547..c89f0bc8c 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -15,6 +15,12 @@ public class Information {
     public static final String SHOW_STATION_INFO = "\n## 역 목록";
 
     public static final String LINE_INFO = "\n## 노선 관리 화면\n1. 노선 등록\n2. 노선 삭제\n3. 노선 조회\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String ADD_LINE_INFO = "\n## 등록할 노선 이름을 입력하세요.";
+    public static final String ADD_LINE_INFO_DOWN_END = "\n## 등록할 노선의 하행 종점역 이름을 입력하세요.";
+    public static final String ADD_LINE_SUCCESS = INFO_HEADER + "지하철 노선이 등록되었습니다.";
+    public static final String DELETE_LINE_INFO = "\n## 삭제할 노선 이름을 입력하세요.";
+    public static final String DELETE_LINE_SUCCESS = INFO_HEADER + "지하철 노선이 삭제되었습니다.";
+    public static final String SHOW_LINE_INFO = "\n## 노선 목록";
 
     public static final String AREA_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
 
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index e3d1dccbd..b12b17b42 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -6,11 +6,12 @@
 
 import java.util.Scanner;
 
-public class LineService {
+public class LineService extends BaseService {
 
     private Scanner scanner;
 
     public LineService(Scanner scanner) {
+        super(scanner, Information.LINE_INFO);
         this.scanner = scanner;
         initLines();
     }
@@ -19,7 +20,19 @@ private void initLines() {
         LineRepository.addLine(InitialData.lines);
     }
 
-    public void run() {
-        System.out.println(Information.LINE_INFO);
+
+    @Override
+    public void add() {
+        System.out.println(Information.ADD_LINE_INFO);
+    }
+
+    @Override
+    public void delete() {
+        System.out.println(Information.DELETE_LINE_INFO);
+    }
+
+    @Override
+    public void show() {
+        System.out.println(Information.SHOW_LINE_INFO);
     }
 }

From 6d6fcfd7393e0217eafc18c8283f40bfa53c74a3 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 21:45:16 +0900
Subject: [PATCH 18/51] feat(line): show all lines' name

---
 README.md                                     | 2 +-
 src/main/java/subway/service/LineService.java | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index dd6056f49..4a5b21aba 100644
--- a/README.md
+++ b/README.md
@@ -506,7 +506,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
 - [ ] 노선 관리
     - [x] 하위 기능을 선택한다. (역 관리와 동일)
-    - [ ] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
+    - [x] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
     - [ ] 노선 등록 시 이름 중복을 확인한다.
     - [ ] 노선 등록 시 이름이 2글자 이상인지 확인한다.
     - [ ] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index b12b17b42..2e27dc8e2 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -2,10 +2,13 @@
 
 import subway.constant.Information;
 import subway.constant.InitialData;
+import subway.domain.Line;
 import subway.repository.LineRepository;
 
 import java.util.Scanner;
 
+import static subway.constant.Information.INFO_HEADER;
+
 public class LineService extends BaseService {
 
     private Scanner scanner;
@@ -33,6 +36,9 @@ public void delete() {
 
     @Override
     public void show() {
-        System.out.println(Information.SHOW_LINE_INFO);
+        System.out.print(Information.SHOW_LINE_INFO);
+        for (Line line : LineRepository.lines())
+            System.out.print(INFO_HEADER + line.getName());
+        System.out.println();
     }
 }

From 4a7719a6c0dc552b29bd827a512a29fd70b9a9a3 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 21:57:32 +0900
Subject: [PATCH 19/51] feat(line): check duplicated name on add

---
 README.md                                     |  2 +-
 .../java/subway/constant/Information.java     |  1 +
 src/main/java/subway/domain/Line.java         | 30 ++++++++++++++-
 .../exception/InvalidInputException.java      |  3 ++
 src/main/java/subway/service/LineService.java | 38 +++++++++++++++++++
 5 files changed, 72 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 4a5b21aba..dd1dbf0ff 100644
--- a/README.md
+++ b/README.md
@@ -507,7 +507,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 - [ ] 노선 관리
     - [x] 하위 기능을 선택한다. (역 관리와 동일)
     - [x] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
-    - [ ] 노선 등록 시 이름 중복을 확인한다.
+    - [x] 노선 등록 시 이름 중복을 확인한다.
     - [ ] 노선 등록 시 이름이 2글자 이상인지 확인한다.
     - [ ] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
     - [ ] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index c89f0bc8c..e1b100f01 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -16,6 +16,7 @@ public class Information {
 
     public static final String LINE_INFO = "\n## 노선 관리 화면\n1. 노선 등록\n2. 노선 삭제\n3. 노선 조회\nB. 돌아가기\n" + CHOOSE_FUNCTION;
     public static final String ADD_LINE_INFO = "\n## 등록할 노선 이름을 입력하세요.";
+    public static final String ADD_LINE_INFO_UP_END = "\n## 등록할 노선의 상행 종점역 이름을 입력하세요.";
     public static final String ADD_LINE_INFO_DOWN_END = "\n## 등록할 노선의 하행 종점역 이름을 입력하세요.";
     public static final String ADD_LINE_SUCCESS = INFO_HEADER + "지하철 노선이 등록되었습니다.";
     public static final String DELETE_LINE_INFO = "\n## 삭제할 노선 이름을 입력하세요.";
diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index 9c9d90f08..260350aa4 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -2,10 +2,14 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 public class Line {
 
     private String name;
+    private Station upEnd;
+    private Station downEnd;
+
     private List<Station> stations = new ArrayList<>();
 
     public Line(String name) {
@@ -17,6 +21,19 @@ public Line(String name, List<Station> stations) {
         this.stations = stations;
     }
 
+    public Line(String name, Station upEnd, Station downEnd) {
+        this.name = name;
+        this.upEnd = upEnd;
+        this.downEnd = downEnd;
+    }
+
+    public Line(String name, List<Station> stations, Station upEnd, Station downEnd) {
+        this.name = name;
+        this.stations = stations;
+        this.upEnd = upEnd;
+        this.downEnd = downEnd;
+    }
+
     public String getName() {
         return name;
     }
@@ -25,5 +42,16 @@ public List<Station> getStations() {
         return stations;
     }
 
-    // 추가 기능 구현
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Line)) return false;
+        Line line = (Line) o;
+        return Objects.equals(name, line.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
 }
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 1620bb821..a3d99c536 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -6,6 +6,7 @@ public enum ExceptionCode {
         INVALID_SERVICE_CODE,
         INVALID_FUNCTION_CODE,
         DUPLICATE_STATION,
+        DUPLICATE_LINE,
         INVALID_NAME_LENGTH;
     }
 
@@ -22,6 +23,8 @@ public String getMessage() {
             return HEADER + "선택할 수 없는 기능입니다.";
         if (exceptionCode.equals(ExceptionCode.DUPLICATE_STATION))
             return HEADER + "이미 등록된 역 이름입니다.";
+        if (exceptionCode.equals(ExceptionCode.DUPLICATE_LINE))
+            return HEADER + "이미 등록된 노선 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.INVALID_NAME_LENGTH))
             return HEADER + "이름은 두 글자 이상이어야 합니다.";
         return "";
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index 2e27dc8e2..dbb69fda6 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -3,6 +3,8 @@
 import subway.constant.Information;
 import subway.constant.InitialData;
 import subway.domain.Line;
+import subway.domain.Station;
+import subway.exception.InvalidInputException;
 import subway.repository.LineRepository;
 
 import java.util.Scanner;
@@ -26,7 +28,43 @@ private void initLines() {
 
     @Override
     public void add() {
+        Line newLine = getNewLineInput();
+        validateNewLine(newLine);
+        LineRepository.addLine(newLine);
+        System.out.println(Information.ADD_LINE_SUCCESS);
+    }
+
+    private Line getNewLineInput() {
+        String name = getNewLineName();
+        Station upEnd = getNewLineUpEnd();
+        Station downEnd = getNewLineDownEnd();
+        Line newLine = new Line(name, upEnd, downEnd);
+        validateNewLine(newLine);
+        return newLine;
+    }
+
+    private String getNewLineName() {
         System.out.println(Information.ADD_LINE_INFO);
+        return scanner.nextLine();
+    }
+
+    private Station getNewLineUpEnd() {
+        System.out.println(Information.ADD_LINE_INFO_UP_END);
+        return new Station(scanner.nextLine());
+    }
+
+    private Station getNewLineDownEnd() {
+        System.out.println(Information.ADD_LINE_INFO_DOWN_END);
+        return new Station(scanner.nextLine());
+    }
+
+    private void validateNewLine(Line newLine) {
+        validateDuplicateLine(newLine);
+    }
+
+    private void validateDuplicateLine(Line newLine) {
+        if (LineRepository.lines().contains(newLine))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_LINE);
     }
 
     @Override

From d99343a4b7d8560aa87e1e7ead0c776137ab9e58 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 21:59:13 +0900
Subject: [PATCH 20/51] feat(line): validate line name length on add

---
 README.md                                     | 2 +-
 src/main/java/subway/service/LineService.java | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index dd1dbf0ff..8ff65a914 100644
--- a/README.md
+++ b/README.md
@@ -508,7 +508,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 하위 기능을 선택한다. (역 관리와 동일)
     - [x] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
     - [x] 노선 등록 시 이름 중복을 확인한다.
-    - [ ] 노선 등록 시 이름이 2글자 이상인지 확인한다.
+    - [x] 노선 등록 시 이름이 2글자 이상인지 확인한다.
     - [ ] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
     - [ ] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
     - [ ] 노선 삭제 시 존재하는 노선인지 확인한다.
\ No newline at end of file
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index dbb69fda6..59ec5cd2f 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -1,5 +1,6 @@
 package subway.service;
 
+import subway.constant.Constant;
 import subway.constant.Information;
 import subway.constant.InitialData;
 import subway.domain.Line;
@@ -59,9 +60,15 @@ private Station getNewLineDownEnd() {
     }
 
     private void validateNewLine(Line newLine) {
+        validateNameLength(newLine);
         validateDuplicateLine(newLine);
     }
 
+    private void validateNameLength(Line newLine) {
+        if (newLine.getName().length() < Constant.MIN_NAME_LENGTH)
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_NAME_LENGTH);
+    }
+
     private void validateDuplicateLine(Line newLine) {
         if (LineRepository.lines().contains(newLine))
             throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_LINE);

From c2e0a91e19e5d60f94e9c9f3de5c4b5bb37c4262 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 22:06:14 +0900
Subject: [PATCH 21/51] feat(line): check up and down end stations exist on add

---
 README.md                                                 | 4 ++--
 src/main/java/subway/domain/Line.java                     | 8 ++++++++
 src/main/java/subway/exception/InvalidInputException.java | 5 ++++-
 src/main/java/subway/service/LineService.java             | 8 ++++++++
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 8ff65a914..56f01c802 100644
--- a/README.md
+++ b/README.md
@@ -509,6 +509,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
     - [x] 노선 등록 시 이름 중복을 확인한다.
     - [x] 노선 등록 시 이름이 2글자 이상인지 확인한다.
-    - [ ] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
-    - [ ] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
+    - [x] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
+    - [x] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
     - [ ] 노선 삭제 시 존재하는 노선인지 확인한다.
\ No newline at end of file
diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index 260350aa4..de0515faf 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -38,6 +38,14 @@ public String getName() {
         return name;
     }
 
+    public Station getUpEnd() {
+        return upEnd;
+    }
+
+    public Station getDownEnd() {
+        return downEnd;
+    }
+
     public List<Station> getStations() {
         return stations;
     }
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index a3d99c536..f4b56e541 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -7,7 +7,8 @@ public enum ExceptionCode {
         INVALID_FUNCTION_CODE,
         DUPLICATE_STATION,
         DUPLICATE_LINE,
-        INVALID_NAME_LENGTH;
+        INVALID_NAME_LENGTH,
+        NO_SUCH_STATION;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -27,6 +28,8 @@ public String getMessage() {
             return HEADER + "이미 등록된 노선 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.INVALID_NAME_LENGTH))
             return HEADER + "이름은 두 글자 이상이어야 합니다.";
+        if (exceptionCode.equals(ExceptionCode.NO_SUCH_STATION))
+            return HEADER + "존재하지 않는 역 이름입니다.";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index 59ec5cd2f..f167331c3 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -7,6 +7,7 @@
 import subway.domain.Station;
 import subway.exception.InvalidInputException;
 import subway.repository.LineRepository;
+import subway.repository.StationRepository;
 
 import java.util.Scanner;
 
@@ -62,6 +63,7 @@ private Station getNewLineDownEnd() {
     private void validateNewLine(Line newLine) {
         validateNameLength(newLine);
         validateDuplicateLine(newLine);
+        validateEndStationsExist(newLine);
     }
 
     private void validateNameLength(Line newLine) {
@@ -74,6 +76,12 @@ private void validateDuplicateLine(Line newLine) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_LINE);
     }
 
+    private void validateEndStationsExist(Line newLine) {
+        if (!StationRepository.stations().contains(newLine.getUpEnd())
+                || !StationRepository.stations().contains(newLine.getDownEnd()))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
+    }
+
     @Override
     public void delete() {
         System.out.println(Information.DELETE_LINE_INFO);

From 6363f054661b1adfae0287a62b93f30b8c6641b3 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 22:12:33 +0900
Subject: [PATCH 22/51] feat(line): check line exists on delete

---
 README.md                                        |  2 +-
 .../subway/exception/InvalidInputException.java  |  5 ++++-
 src/main/java/subway/service/LineService.java    | 16 ++++++++++++++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 56f01c802..5b346e20d 100644
--- a/README.md
+++ b/README.md
@@ -511,4 +511,4 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 노선 등록 시 이름이 2글자 이상인지 확인한다.
     - [x] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
     - [x] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
-    - [ ] 노선 삭제 시 존재하는 노선인지 확인한다.
\ No newline at end of file
+    - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
\ No newline at end of file
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index f4b56e541..40ad5368a 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -8,7 +8,8 @@ public enum ExceptionCode {
         DUPLICATE_STATION,
         DUPLICATE_LINE,
         INVALID_NAME_LENGTH,
-        NO_SUCH_STATION;
+        NO_SUCH_STATION,
+        NO_SUCH_LINE;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -30,6 +31,8 @@ public String getMessage() {
             return HEADER + "이름은 두 글자 이상이어야 합니다.";
         if (exceptionCode.equals(ExceptionCode.NO_SUCH_STATION))
             return HEADER + "존재하지 않는 역 이름입니다.";
+        if (exceptionCode.equals(ExceptionCode.NO_SUCH_LINE))
+            return HEADER + "존재하지 않는 노선 이름입니다.";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index f167331c3..c48fcbfe1 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -82,11 +82,27 @@ private void validateEndStationsExist(Line newLine) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
     }
 
+
     @Override
     public void delete() {
+        String targetLineName = getTargetLineName();
+        validateLineExists(targetLineName);
+        LineRepository.deleteLineByName(targetLineName);
+        System.out.println(Information.DELETE_LINE_SUCCESS);
+    }
+
+    private String getTargetLineName() {
         System.out.println(Information.DELETE_LINE_INFO);
+        return scanner.nextLine();
     }
 
+    private void validateLineExists(String targetLineName) {
+        Line targetLine = new Line(targetLineName);
+        if (!LineRepository.lines().contains(targetLine))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_LINE);
+    }
+
+
     @Override
     public void show() {
         System.out.print(Information.SHOW_LINE_INFO);

From cc9fb30ae8b664d8453fa53f85b9f6f8f4661655 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 22:40:52 +0900
Subject: [PATCH 23/51] docs(readme): update the list to implement link service

---
 README.md | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 5b346e20d..078c96bfa 100644
--- a/README.md
+++ b/README.md
@@ -504,11 +504,18 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 역 등록 시 이름 중복을 확인한다.
     - [x] 역 등록 시 이름이 2글자 이상인지 확인한다.
     - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
-- [ ] 노선 관리
+- [x] 노선 관리
     - [x] 하위 기능을 선택한다. (역 관리와 동일)
     - [x] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
     - [x] 노선 등록 시 이름 중복을 확인한다.
     - [x] 노선 등록 시 이름이 2글자 이상인지 확인한다.
     - [x] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
     - [x] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
-    - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
\ No newline at end of file
+    - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
+- [ ] 구간 관리
+    - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+    - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
+    - [ ] 구간 등록 시 존재하는 노선인지 확인한다.
+    - [ ] 구간 등록 시 존재하는 역인지 확인한다.
+    - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
+    - [ ] 구간 삭제 시 존재하는 역인지 확인한다.

From e141daec81de414b7372ce5251d97d2eaacaf9fd Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 22:41:16 +0900
Subject: [PATCH 24/51] refactor: rename area into link

---
 src/main/java/subway/constant/Information.java            | 2 +-
 src/main/java/subway/constant/Service.java                | 2 +-
 .../subway/service/{AreaService.java => LinkService.java} | 6 +++---
 src/main/java/subway/service/MainService.java             | 8 ++++----
 4 files changed, 9 insertions(+), 9 deletions(-)
 rename src/main/java/subway/service/{AreaService.java => LinkService.java} (61%)

diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index e1b100f01..49b7ba58e 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -23,7 +23,7 @@ public class Information {
     public static final String DELETE_LINE_SUCCESS = INFO_HEADER + "지하철 노선이 삭제되었습니다.";
     public static final String SHOW_LINE_INFO = "\n## 노선 목록";
 
-    public static final String AREA_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String LINK_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
 
     public static final String MAP_INFO = "\n## 지하철 노선도";
 }
diff --git a/src/main/java/subway/constant/Service.java b/src/main/java/subway/constant/Service.java
index 835acdd75..b5c45f1da 100644
--- a/src/main/java/subway/constant/Service.java
+++ b/src/main/java/subway/constant/Service.java
@@ -9,7 +9,7 @@ public enum Service {
 
     STATION("1"),
     LINE("2"),
-    AREA("3"),
+    LINK("3"),
     MAP("4"),
     QUIT("Q");
 
diff --git a/src/main/java/subway/service/AreaService.java b/src/main/java/subway/service/LinkService.java
similarity index 61%
rename from src/main/java/subway/service/AreaService.java
rename to src/main/java/subway/service/LinkService.java
index 13abc0363..95e1e17b2 100644
--- a/src/main/java/subway/service/AreaService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -4,15 +4,15 @@
 
 import java.util.Scanner;
 
-public class AreaService {
+public class LinkService {
 
     private Scanner scanner;
 
-    public AreaService(Scanner scanner) {
+    public LinkService(Scanner scanner) {
         this.scanner = scanner;
     }
 
     public void run() {
-        System.out.println(Information.AREA_INFO);
+        System.out.println(Information.LINK_INFO);
     }
 }
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index bb5d423e8..090ec8c6b 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -13,14 +13,14 @@ public class MainService {
 
     private StationService stationService;
     private LineService lineService;
-    private AreaService areaService;
+    private LinkService linkService;
     private MapService mapService;
 
     public MainService(Scanner scanner) {
         this.scanner = scanner;
         stationService = new StationService(scanner);
         lineService = new LineService(scanner);
-        areaService = new AreaService(scanner);
+        linkService = new LinkService(scanner);
         mapService = new MapService();
     }
 
@@ -55,8 +55,8 @@ private void runSelectedService(String selectedService) {
             stationService.run();
         if (selectedService.equals(Service.LINE.getCode()))
             lineService.run();
-        if (selectedService.equals(Service.AREA.getCode()))
-            areaService.run();
+        if (selectedService.equals(Service.LINK.getCode()))
+            linkService.run();
         if (selectedService.equals(Service.MAP.getCode()))
             mapService.run();
         if (selectedService.equals(Service.QUIT.getCode()))

From 80f56074c6623c25c2f3a476ec85c7af7e769804 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 22:48:13 +0900
Subject: [PATCH 25/51] refactor: rename service interface and classes

---
 src/main/java/subway/constant/Information.java      |  2 +-
 .../service/{BaseService.java => CrudService.java}  |  7 ++-----
 src/main/java/subway/service/LineService.java       |  2 +-
 src/main/java/subway/service/MainService.java       |  6 +++---
 src/main/java/subway/service/MapService.java        |  7 ++-----
 src/main/java/subway/service/PrintService.java      | 10 ++++++++++
 src/main/java/subway/service/Service.java           | 13 -------------
 src/main/java/subway/service/StationService.java    |  2 +-
 8 files changed, 20 insertions(+), 29 deletions(-)
 rename src/main/java/subway/service/{BaseService.java => CrudService.java} (88%)
 create mode 100644 src/main/java/subway/service/PrintService.java
 delete mode 100644 src/main/java/subway/service/Service.java

diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index 49b7ba58e..b8487ca06 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -25,5 +25,5 @@ public class Information {
 
     public static final String LINK_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
 
-    public static final String MAP_INFO = "\n## 지하철 노선도";
+    public static final String PRINT_INFO = "\n## 지하철 노선도";
 }
diff --git a/src/main/java/subway/service/BaseService.java b/src/main/java/subway/service/CrudService.java
similarity index 88%
rename from src/main/java/subway/service/BaseService.java
rename to src/main/java/subway/service/CrudService.java
index c9c878c46..420e7661c 100644
--- a/src/main/java/subway/service/BaseService.java
+++ b/src/main/java/subway/service/CrudService.java
@@ -5,12 +5,12 @@
 
 import java.util.Scanner;
 
-public abstract class BaseService implements Service {
+public abstract class CrudService implements MapService {
 
     private Scanner scanner;
     private String info;
 
-    public BaseService(Scanner scanner, String info) {
+    public CrudService(Scanner scanner, String info) {
         this.scanner = scanner;
         this.info = info;
     }
@@ -45,12 +45,9 @@ private void runSelectedFunction(String selectedFunction) {
             show();
     }
 
-    @Override
     public abstract void add();
 
-    @Override
     public abstract void delete();
 
-    @Override
     public abstract void show();
 }
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index c48fcbfe1..a35d468cf 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -13,7 +13,7 @@
 
 import static subway.constant.Information.INFO_HEADER;
 
-public class LineService extends BaseService {
+public class LineService extends CrudService {
 
     private Scanner scanner;
 
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 090ec8c6b..8daf2d31d 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -14,14 +14,14 @@ public class MainService {
     private StationService stationService;
     private LineService lineService;
     private LinkService linkService;
-    private MapService mapService;
+    private PrintService printService;
 
     public MainService(Scanner scanner) {
         this.scanner = scanner;
         stationService = new StationService(scanner);
         lineService = new LineService(scanner);
         linkService = new LinkService(scanner);
-        mapService = new MapService();
+        printService = new PrintService();
     }
 
 
@@ -58,7 +58,7 @@ private void runSelectedService(String selectedService) {
         if (selectedService.equals(Service.LINK.getCode()))
             linkService.run();
         if (selectedService.equals(Service.MAP.getCode()))
-            mapService.run();
+            printService.run();
         if (selectedService.equals(Service.QUIT.getCode()))
             isContinue = false;
     }
diff --git a/src/main/java/subway/service/MapService.java b/src/main/java/subway/service/MapService.java
index 3579db3da..f9266c8ae 100644
--- a/src/main/java/subway/service/MapService.java
+++ b/src/main/java/subway/service/MapService.java
@@ -1,10 +1,7 @@
 package subway.service;
 
-import subway.constant.Information;
+public interface MapService {
 
-public class MapService {
+    void run();
 
-    public void run() {
-        System.out.println(Information.MAP_INFO);
-    }
 }
diff --git a/src/main/java/subway/service/PrintService.java b/src/main/java/subway/service/PrintService.java
new file mode 100644
index 000000000..5491e5f60
--- /dev/null
+++ b/src/main/java/subway/service/PrintService.java
@@ -0,0 +1,10 @@
+package subway.service;
+
+import subway.constant.Information;
+
+public class PrintService {
+
+    public void run() {
+        System.out.println(Information.PRINT_INFO);
+    }
+}
diff --git a/src/main/java/subway/service/Service.java b/src/main/java/subway/service/Service.java
deleted file mode 100644
index 4df566bfd..000000000
--- a/src/main/java/subway/service/Service.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package subway.service;
-
-public interface Service {
-
-    void run();
-
-    void add();
-
-    void delete();
-
-    void show();
-
-}
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index d1617ca7e..20517083e 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -11,7 +11,7 @@
 
 import static subway.constant.Information.INFO_HEADER;
 
-public class StationService extends BaseService {
+public class StationService extends CrudService {
 
     private Scanner scanner;
 

From 40475110782542ff8080a6719b89f953e6db551a Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 23:04:55 +0900
Subject: [PATCH 26/51] refactor: simplify constructors of line class

---
 src/main/java/subway/domain/Line.java | 13 +++++--------
 src/main/java/subway/domain/Map.java  |  8 --------
 2 files changed, 5 insertions(+), 16 deletions(-)
 delete mode 100644 src/main/java/subway/domain/Map.java

diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index de0515faf..f01872955 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -6,6 +6,8 @@
 
 public class Line {
 
+    private static final int UP_END_INDEX = 0;
+
     private String name;
     private Station upEnd;
     private Station downEnd;
@@ -16,22 +18,17 @@ public Line(String name) {
         this.name = name;
     }
 
-    public Line(String name, List<Station> stations) {
-        this.name = name;
-        this.stations = stations;
-    }
-
     public Line(String name, Station upEnd, Station downEnd) {
         this.name = name;
         this.upEnd = upEnd;
         this.downEnd = downEnd;
     }
 
-    public Line(String name, List<Station> stations, Station upEnd, Station downEnd) {
+    public Line(String name, List<Station> stations) {
         this.name = name;
         this.stations = stations;
-        this.upEnd = upEnd;
-        this.downEnd = downEnd;
+        this.upEnd = stations.get(UP_END_INDEX);
+        this.downEnd = stations.get(stations.size() - 1);
     }
 
     public String getName() {
diff --git a/src/main/java/subway/domain/Map.java b/src/main/java/subway/domain/Map.java
deleted file mode 100644
index dd8b09b49..000000000
--- a/src/main/java/subway/domain/Map.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package subway.domain;
-
-public class Map {
-
-    public Map() {
-        // TODO 노선 초기화
-    }
-}

From 38e7d399695bf28d354dbb11f0cd1c7015ffbf0e Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 23:05:32 +0900
Subject: [PATCH 27/51] feat(link): select function and validate input

---
 README.md                                     |  2 +-
 .../java/subway/constant/Information.java     |  7 +++++++
 src/main/java/subway/service/LinkService.java | 19 ++++++++++++++++---
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 078c96bfa..b813455ea 100644
--- a/README.md
+++ b/README.md
@@ -513,7 +513,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
     - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
 - [ ] 구간 관리
-    - [ ] 선택지에 없는 입력일 시 에러메세지를 출력한다.
+    - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
     - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
     - [ ] 구간 등록 시 존재하는 노선인지 확인한다.
     - [ ] 구간 등록 시 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index b8487ca06..ecb975e41 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -24,6 +24,13 @@ public class Information {
     public static final String SHOW_LINE_INFO = "\n## 노선 목록";
 
     public static final String LINK_INFO = "\n## 구간 관리 화면\n1. 구간 등록\n2. 구간 삭제\nB. 돌아가기\n" + CHOOSE_FUNCTION;
+    public static final String ADD_LINK_INFO_LINE = "\n## 노선 이름을 입력하세요.";
+    public static final String ADD_LINK_INFO_STATION = "\n## 역 이름을 입력하세요.";
+    public static final String ADD_LINK_INFO_ORDER = "\n## 순서를 입력하세요.";
+    public static final String ADD_LINK_SUCCESS = INFO_HEADER + "구간이 등록되었습니다.";
+    public static final String DELETE_LINK_INFO_LINE = "\n## 삭제할 구간의 노선 이름을 입력하세요.";
+    public static final String DELETE_LINK_INFO_STATION = "\n## 삭제할 구간의 역 이름을 입력하세요.";
+    public static final String DELETE_LINK_SUCCESS = INFO_HEADER + "구간이 삭제되었습니다.";
 
     public static final String PRINT_INFO = "\n## 지하철 노선도";
 }
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 95e1e17b2..008b99252 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -1,18 +1,31 @@
 package subway.service;
 
 import subway.constant.Information;
+import subway.exception.InvalidInputException;
 
 import java.util.Scanner;
 
-public class LinkService {
+public class LinkService extends CrudService {
 
     private Scanner scanner;
 
     public LinkService(Scanner scanner) {
+        super(scanner, Information.LINK_INFO);
         this.scanner = scanner;
     }
 
-    public void run() {
-        System.out.println(Information.LINK_INFO);
+    @Override
+    public void add() {
+
+    }
+
+    @Override
+    public void delete() {
+
+    }
+
+    @Override
+    public void show() {
+        throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_FUNCTION_CODE);
     }
 }

From 80300549dfe39c4f66833fceb976224c44a24683 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 23:07:00 +0900
Subject: [PATCH 28/51] feat(link): run function on user input

---
 README.md                                     | 2 +-
 src/main/java/subway/service/LinkService.java | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index b813455ea..8e7d11c2f 100644
--- a/README.md
+++ b/README.md
@@ -514,7 +514,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
 - [ ] 구간 관리
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
-    - [ ] 사용자 입력에 따라 하위 기능을 실행한다.
+    - [x] 사용자 입력에 따라 하위 기능을 실행한다.
     - [ ] 구간 등록 시 존재하는 노선인지 확인한다.
     - [ ] 구간 등록 시 존재하는 역인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 008b99252..e929cba1d 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -16,12 +16,12 @@ public LinkService(Scanner scanner) {
 
     @Override
     public void add() {
-
+        System.out.println(Information.ADD_LINK_INFO_LINE);
     }
 
     @Override
     public void delete() {
-
+        System.out.println(Information.DELETE_LINK_INFO_LINE);
     }
 
     @Override

From e1e36000ab6dac260550a9b4dcfef8afe7703901 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 23:17:39 +0900
Subject: [PATCH 29/51] feat(link): check line exists on add

---
 README.md                                     |  3 +-
 src/main/java/subway/domain/Link.java         | 26 +++++++++++++
 src/main/java/subway/service/LinkService.java | 38 +++++++++++++++++++
 3 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/subway/domain/Link.java

diff --git a/README.md b/README.md
index 8e7d11c2f..9f1a8f0af 100644
--- a/README.md
+++ b/README.md
@@ -515,7 +515,8 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 - [ ] 구간 관리
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
-    - [ ] 구간 등록 시 존재하는 노선인지 확인한다.
+    - [x] 구간 등록 시 존재하는 노선인지 확인한다.
     - [ ] 구간 등록 시 존재하는 역인지 확인한다.
+    - [ ] 구간 등록 시 순서 입력이 숫자인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/domain/Link.java b/src/main/java/subway/domain/Link.java
new file mode 100644
index 000000000..9e560ddfd
--- /dev/null
+++ b/src/main/java/subway/domain/Link.java
@@ -0,0 +1,26 @@
+package subway.domain;
+
+public class Link {
+
+    private String lineName;
+    private String stationName;
+    private int order;
+
+    public Link(String lineName, String stationName, int order) {
+        this.lineName = lineName;
+        this.stationName = stationName;
+        this.order = order;
+    }
+
+    public String getLineName() {
+        return lineName;
+    }
+
+    public String getStationName() {
+        return stationName;
+    }
+
+    public int getOrder() {
+        return order;
+    }
+}
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index e929cba1d..a9b5caa70 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -1,7 +1,12 @@
 package subway.service;
 
 import subway.constant.Information;
+import subway.domain.Line;
+import subway.domain.Link;
+import subway.domain.Station;
 import subway.exception.InvalidInputException;
+import subway.repository.LineRepository;
+import subway.repository.StationRepository;
 
 import java.util.Scanner;
 
@@ -16,7 +21,40 @@ public LinkService(Scanner scanner) {
 
     @Override
     public void add() {
+        Link newLink = getNewLinkInput();
+        validateNewLink(newLink);
+    }
+
+    private Link getNewLinkInput() {
+        String lineName = getLineName();
+        String stationName = getStationName();
+        int order = getOrder();
+        return new Link(lineName, stationName, order);
+    }
+
+    private String getLineName() {
         System.out.println(Information.ADD_LINK_INFO_LINE);
+        return scanner.nextLine();
+    }
+
+    private String getStationName() {
+        System.out.println(Information.ADD_LINK_INFO_STATION);
+        return scanner.nextLine();
+    }
+
+    private int getOrder() {
+        System.out.println(Information.ADD_LINK_INFO_ORDER);
+        return Integer.parseInt(scanner.nextLine());
+    }
+
+    private void validateNewLink(Link newLink) {
+        validateLineExists(newLink.getLineName());
+    }
+
+    private void validateLineExists(String lineName) {
+        Line line = new Line(lineName);
+        if (!LineRepository.lines().contains(line))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_LINE);
     }
 
     @Override

From 28b53adec42db9384e595f0b74a1dd50af7b2254 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 23:19:08 +0900
Subject: [PATCH 30/51] feat(link): check station exists on add

---
 README.md                                     | 2 +-
 src/main/java/subway/service/LinkService.java | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 9f1a8f0af..693b1d4a1 100644
--- a/README.md
+++ b/README.md
@@ -516,7 +516,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
     - [x] 구간 등록 시 존재하는 노선인지 확인한다.
-    - [ ] 구간 등록 시 존재하는 역인지 확인한다.
+    - [x] 구간 등록 시 존재하는 역인지 확인한다.
     - [ ] 구간 등록 시 순서 입력이 숫자인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index a9b5caa70..c215b95b8 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -49,6 +49,7 @@ private int getOrder() {
 
     private void validateNewLink(Link newLink) {
         validateLineExists(newLink.getLineName());
+        validateStationExists(newLink.getStationName());
     }
 
     private void validateLineExists(String lineName) {
@@ -57,6 +58,12 @@ private void validateLineExists(String lineName) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_LINE);
     }
 
+    private void validateStationExists(String stationName) {
+        Station station = new Station(stationName);
+        if (!StationRepository.stations().contains(station))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
+    }
+
     @Override
     public void delete() {
         System.out.println(Information.DELETE_LINK_INFO_LINE);

From af781290c3f888bca536c7adfe04fa056c9161a1 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Fri, 11 Dec 2020 23:32:32 +0900
Subject: [PATCH 31/51] feat(link): validate order input if it's integer

---
 README.md                                            |  3 ++-
 .../java/subway/exception/InvalidInputException.java |  5 ++++-
 src/main/java/subway/service/LinkService.java        | 12 ++++++++----
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 693b1d4a1..39e5f0451 100644
--- a/README.md
+++ b/README.md
@@ -517,6 +517,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
     - [x] 구간 등록 시 존재하는 노선인지 확인한다.
     - [x] 구간 등록 시 존재하는 역인지 확인한다.
-    - [ ] 구간 등록 시 순서 입력이 숫자인지 확인한다.
+    - [x] 구간 등록 시 순서 입력이 숫자가 아니면 에러메세지를 출력한다.
+    - [ ] 구간 등록 시 순서 입력이 범위 내 숫자가 아니면 에러메세지를 출력한다.
     - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 40ad5368a..308622072 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -9,7 +9,8 @@ public enum ExceptionCode {
         DUPLICATE_LINE,
         INVALID_NAME_LENGTH,
         NO_SUCH_STATION,
-        NO_SUCH_LINE;
+        NO_SUCH_LINE,
+        NON_NUMBER_INPUT;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -33,6 +34,8 @@ public String getMessage() {
             return HEADER + "존재하지 않는 역 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.NO_SUCH_LINE))
             return HEADER + "존재하지 않는 노선 이름입니다.";
+        if (exceptionCode.equals(ExceptionCode.NON_NUMBER_INPUT))
+            return HEADER + "순서는 숫자로 입력해야 합니다.";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index c215b95b8..1b2551ca8 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -21,11 +21,15 @@ public LinkService(Scanner scanner) {
 
     @Override
     public void add() {
-        Link newLink = getNewLinkInput();
-        validateNewLink(newLink);
+        try {
+            Link newLink = getNewLinkInput();
+            validateNewLink(newLink);
+        } catch (NumberFormatException e) {
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NON_NUMBER_INPUT);
+        }
     }
 
-    private Link getNewLinkInput() {
+    private Link getNewLinkInput() throws NumberFormatException {
         String lineName = getLineName();
         String stationName = getStationName();
         int order = getOrder();
@@ -42,7 +46,7 @@ private String getStationName() {
         return scanner.nextLine();
     }
 
-    private int getOrder() {
+    private int getOrder() throws NumberFormatException {
         System.out.println(Information.ADD_LINK_INFO_ORDER);
         return Integer.parseInt(scanner.nextLine());
     }

From 3a41cf0dc1e0d2a9e4a0c78606b115c27abc4a6a Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 00:16:51 +0900
Subject: [PATCH 32/51] feat(link): add new link on proper parameters

---
 README.md                                     |  2 +-
 src/main/java/subway/constant/Constant.java   |  1 +
 .../java/subway/constant/InitialData.java     | 21 +++++++++--------
 src/main/java/subway/domain/Line.java         |  6 +++++
 .../exception/InvalidInputException.java      |  5 +++-
 .../subway/repository/LineRepository.java     |  5 ++++
 src/main/java/subway/service/LinkService.java | 23 ++++++++++++++++++-
 7 files changed, 50 insertions(+), 13 deletions(-)

diff --git a/README.md b/README.md
index 39e5f0451..fef345673 100644
--- a/README.md
+++ b/README.md
@@ -518,6 +518,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 등록 시 존재하는 노선인지 확인한다.
     - [x] 구간 등록 시 존재하는 역인지 확인한다.
     - [x] 구간 등록 시 순서 입력이 숫자가 아니면 에러메세지를 출력한다.
-    - [ ] 구간 등록 시 순서 입력이 범위 내 숫자가 아니면 에러메세지를 출력한다.
+    - [x] 구간 등록 시 순서 입력이 범위 내 숫자가 아니면 에러메세지를 출력한다.
     - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/constant/Constant.java b/src/main/java/subway/constant/Constant.java
index 4f47915b2..841ee7326 100644
--- a/src/main/java/subway/constant/Constant.java
+++ b/src/main/java/subway/constant/Constant.java
@@ -3,4 +3,5 @@
 public class Constant {
 
     public static final int MIN_NAME_LENGTH = 2;
+    public static final int MIN_ORDER = 0;
 }
diff --git a/src/main/java/subway/constant/InitialData.java b/src/main/java/subway/constant/InitialData.java
index af6efe715..15991cc21 100644
--- a/src/main/java/subway/constant/InitialData.java
+++ b/src/main/java/subway/constant/InitialData.java
@@ -3,12 +3,13 @@
 import subway.domain.Line;
 import subway.domain.Station;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
 public class InitialData {
 
-    public static final List<Station> stations = Arrays.asList(
+    public static final List<Station> stations = new ArrayList<>(Arrays.asList(
             new Station("교대역"),
             new Station("강남역"),
             new Station("역삼역"),
@@ -16,31 +17,31 @@ public class InitialData {
             new Station("양재역"),
             new Station("양재시민의숲역"),
             new Station("매봉역")
-    );
+    ));
 
 
-    private static final List<Station> lineTwoStations = Arrays.asList(
+    private static final List<Station> lineTwoStations = new ArrayList<>(Arrays.asList(
             new Station("교대역"),
             new Station("강남역"),
             new Station("역삼역")
-    );
+    ));
 
-    private static final List<Station> lineThreeStations = Arrays.asList(
+    private static final List<Station> lineThreeStations = new ArrayList<>(Arrays.asList(
             new Station("교대역"),
             new Station("남부터미널역"),
             new Station("양재역"),
             new Station("매봉역")
-    );
+    ));
 
-    private static final List<Station> lineSinbundangStations = Arrays.asList(
+    private static final List<Station> lineSinbundangStations = new ArrayList<>(Arrays.asList(
             new Station("강남역"),
             new Station("양재역"),
             new Station("양재시민의숲역")
-    );
+    ));
 
-    public static final List<Line> lines = Arrays.asList(
+    public static final List<Line> lines = new ArrayList<>(Arrays.asList(
             new Line("2호선", lineTwoStations),
             new Line("3호선", lineThreeStations),
             new Line("신분당선", lineSinbundangStations)
-    );
+    ));
 }
diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index f01872955..c8019f782 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -59,4 +59,10 @@ public boolean equals(Object o) {
     public int hashCode() {
         return Objects.hash(name);
     }
+
+    public void addNewLink(Link newLink) {
+        Station station = new Station(newLink.getStationName());
+        int targetIndex = newLink.getOrder();
+        stations.add(targetIndex, station);
+    }
 }
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 308622072..230191451 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -10,7 +10,8 @@ public enum ExceptionCode {
         INVALID_NAME_LENGTH,
         NO_SUCH_STATION,
         NO_SUCH_LINE,
-        NON_NUMBER_INPUT;
+        NON_NUMBER_INPUT,
+        OUT_OF_LINE_RANGE;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -36,6 +37,8 @@ public String getMessage() {
             return HEADER + "존재하지 않는 노선 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.NON_NUMBER_INPUT))
             return HEADER + "순서는 숫자로 입력해야 합니다.";
+        if (exceptionCode.equals(ExceptionCode.OUT_OF_LINE_RANGE))
+            return HEADER + "순서는 해당 노선의 범위 안에서 입력해야 합니다.";
         return "";
     }
 }
diff --git a/src/main/java/subway/repository/LineRepository.java b/src/main/java/subway/repository/LineRepository.java
index d4e37473d..9d8ef80bc 100644
--- a/src/main/java/subway/repository/LineRepository.java
+++ b/src/main/java/subway/repository/LineRepository.java
@@ -26,4 +26,9 @@ public static void addLine(List<Line> lines) {
     public static boolean deleteLineByName(String name) {
         return lines.removeIf(line -> Objects.equals(line.getName(), name));
     }
+
+    public static Line getLineByName(String name) {
+        int index = lines.indexOf(new Line(name));
+        return lines.get(index);
+    }
 }
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 1b2551ca8..074274e2e 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -10,6 +10,8 @@
 
 import java.util.Scanner;
 
+import static subway.constant.Constant.MIN_ORDER;
+
 public class LinkService extends CrudService {
 
     private Scanner scanner;
@@ -24,6 +26,7 @@ public void add() {
         try {
             Link newLink = getNewLinkInput();
             validateNewLink(newLink);
+            addNewLink(newLink);
         } catch (NumberFormatException e) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NON_NUMBER_INPUT);
         }
@@ -48,12 +51,13 @@ private String getStationName() {
 
     private int getOrder() throws NumberFormatException {
         System.out.println(Information.ADD_LINK_INFO_ORDER);
-        return Integer.parseInt(scanner.nextLine());
+        return Integer.parseInt(scanner.nextLine()) - 1;
     }
 
     private void validateNewLink(Link newLink) {
         validateLineExists(newLink.getLineName());
         validateStationExists(newLink.getStationName());
+        validateOrderInRange(newLink);
     }
 
     private void validateLineExists(String lineName) {
@@ -68,6 +72,23 @@ private void validateStationExists(String stationName) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
     }
 
+    private void validateOrderInRange(Link newLink) {
+        Line line = getTargetLine(newLink.getLineName());
+        if (newLink.getOrder() < MIN_ORDER || newLink.getOrder() > line.getStations().size())
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.OUT_OF_LINE_RANGE);
+    }
+
+    private Line getTargetLine(String lineName) {
+        return LineRepository.getLineByName(lineName);
+    }
+
+    private void addNewLink(Link newLink) {
+        Line line = getTargetLine(newLink.getLineName());
+        line.addNewLink(newLink);
+        System.out.println(Information.ADD_LINK_SUCCESS);
+    }
+
+
     @Override
     public void delete() {
         System.out.println(Information.DELETE_LINK_INFO_LINE);

From 571c6cea86fe9b7228d975e456960aa60f16f060 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 00:29:57 +0900
Subject: [PATCH 33/51] feat(link): update up and down ends on add

---
 README.md                             | 1 +
 src/main/java/subway/domain/Line.java | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/README.md b/README.md
index fef345673..766da5c68 100644
--- a/README.md
+++ b/README.md
@@ -519,5 +519,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 등록 시 존재하는 역인지 확인한다.
     - [x] 구간 등록 시 순서 입력이 숫자가 아니면 에러메세지를 출력한다.
     - [x] 구간 등록 시 순서 입력이 범위 내 숫자가 아니면 에러메세지를 출력한다.
+    - [x] 구간 등록 시 상하행 종점역을 갱신한다.
     - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
     - [ ] 구간 삭제 시 존재하는 역인지 확인한다.
diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index c8019f782..15f3a5b67 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -27,6 +27,10 @@ public Line(String name, Station upEnd, Station downEnd) {
     public Line(String name, List<Station> stations) {
         this.name = name;
         this.stations = stations;
+        setUpAndDownEndStations();
+    }
+
+    private void setUpAndDownEndStations() {
         this.upEnd = stations.get(UP_END_INDEX);
         this.downEnd = stations.get(stations.size() - 1);
     }
@@ -64,5 +68,6 @@ public void addNewLink(Link newLink) {
         Station station = new Station(newLink.getStationName());
         int targetIndex = newLink.getOrder();
         stations.add(targetIndex, station);
+        setUpAndDownEndStations();
     }
 }

From 83bfe8b76bcf11f3996358ea48b209d1b0fa2673 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 00:39:27 +0900
Subject: [PATCH 34/51] feat(link): check line and station exist on delete

---
 README.md                                     |  5 +--
 src/main/java/subway/domain/Link.java         |  5 +++
 src/main/java/subway/service/LinkService.java | 31 ++++++++++++++++---
 3 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 766da5c68..302f8f38f 100644
--- a/README.md
+++ b/README.md
@@ -520,5 +520,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 등록 시 순서 입력이 숫자가 아니면 에러메세지를 출력한다.
     - [x] 구간 등록 시 순서 입력이 범위 내 숫자가 아니면 에러메세지를 출력한다.
     - [x] 구간 등록 시 상하행 종점역을 갱신한다.
-    - [ ] 구간 삭제 시 존재하는 노선인지 확인한다.
-    - [ ] 구간 삭제 시 존재하는 역인지 확인한다.
+    - [x] 구간 삭제 시 존재하는 노선인지 확인한다.
+    - [x] 구간 삭제 시 존재하는 역인지 확인한다.
+    - [ ] 구간 삭제 시 노선에 남은 역이 2개 초과인지 확인한다.
diff --git a/src/main/java/subway/domain/Link.java b/src/main/java/subway/domain/Link.java
index 9e560ddfd..76e05f11c 100644
--- a/src/main/java/subway/domain/Link.java
+++ b/src/main/java/subway/domain/Link.java
@@ -12,6 +12,11 @@ public Link(String lineName, String stationName, int order) {
         this.order = order;
     }
 
+    public Link(String targetLineName, String targetStationName) {
+        this.lineName = targetLineName;
+        this.stationName = targetStationName;
+    }
+
     public String getLineName() {
         return lineName;
     }
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 074274e2e..a82399689 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -33,18 +33,18 @@ public void add() {
     }
 
     private Link getNewLinkInput() throws NumberFormatException {
-        String lineName = getLineName();
-        String stationName = getStationName();
+        String lineName = getLineNameOnAdd();
+        String stationName = getStationNameOnAdd();
         int order = getOrder();
         return new Link(lineName, stationName, order);
     }
 
-    private String getLineName() {
+    private String getLineNameOnAdd() {
         System.out.println(Information.ADD_LINK_INFO_LINE);
         return scanner.nextLine();
     }
 
-    private String getStationName() {
+    private String getStationNameOnAdd() {
         System.out.println(Information.ADD_LINK_INFO_STATION);
         return scanner.nextLine();
     }
@@ -91,7 +91,30 @@ private void addNewLink(Link newLink) {
 
     @Override
     public void delete() {
+        Link targetLink = getTargetLinkInput();
+        validateTargetLink(targetLink);
+        System.out.println(Information.DELETE_LINK_SUCCESS);
+    }
+
+    private Link getTargetLinkInput() {
+        String targetLineName = getTargetLineNameOnDelete();
+        String targetStationName = getTargetStationNameOnDelete();
+        return new Link(targetLineName, targetStationName);
+    }
+
+    private String getTargetLineNameOnDelete() {
         System.out.println(Information.DELETE_LINK_INFO_LINE);
+        return scanner.nextLine();
+    }
+
+    private String getTargetStationNameOnDelete() {
+        System.out.println(Information.DELETE_LINK_INFO_STATION);
+        return scanner.nextLine();
+    }
+
+    private void validateTargetLink(Link targetLink) {
+        validateLineExists(targetLink.getLineName());
+        validateStationExists(targetLink.getStationName());
     }
 
     @Override

From f8b4ddf6cede18f15ded38816ae3664259e3fd85 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 00:54:02 +0900
Subject: [PATCH 35/51] feat(link): check remaining link count of the line on
 delete

---
 README.md                                         |  5 +++--
 src/main/java/subway/constant/Constant.java       |  1 +
 src/main/java/subway/domain/Line.java             |  6 ++++++
 .../subway/exception/InvalidInputException.java   |  5 ++++-
 src/main/java/subway/service/LinkService.java     | 15 +++++++++++++++
 5 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 302f8f38f..7c03a79a5 100644
--- a/README.md
+++ b/README.md
@@ -512,7 +512,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
     - [x] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
     - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
-- [ ] 구간 관리
+- [x] 구간 관리
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
     - [x] 구간 등록 시 존재하는 노선인지 확인한다.
@@ -522,4 +522,5 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 등록 시 상하행 종점역을 갱신한다.
     - [x] 구간 삭제 시 존재하는 노선인지 확인한다.
     - [x] 구간 삭제 시 존재하는 역인지 확인한다.
-    - [ ] 구간 삭제 시 노선에 남은 역이 2개 초과인지 확인한다.
+    - [x] 구간 삭제 시 노선에 남은 역이 2개 초과인지 확인한다.
+    - [x] 구간 삭제 시 상하행 종점역을 갱신한다.
diff --git a/src/main/java/subway/constant/Constant.java b/src/main/java/subway/constant/Constant.java
index 841ee7326..291d2d3c9 100644
--- a/src/main/java/subway/constant/Constant.java
+++ b/src/main/java/subway/constant/Constant.java
@@ -4,4 +4,5 @@ public class Constant {
 
     public static final int MIN_NAME_LENGTH = 2;
     public static final int MIN_ORDER = 0;
+    public static final int MIN_LINE_LENGTH = 3;
 }
diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index 15f3a5b67..abcba6982 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -70,4 +70,10 @@ public void addNewLink(Link newLink) {
         stations.add(targetIndex, station);
         setUpAndDownEndStations();
     }
+
+    public void deleteTargetLink(Link targetLink) {
+        Station station = new Station(targetLink.getStationName());
+        stations.remove(station);
+        setUpAndDownEndStations();
+    }
 }
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 230191451..f49151cd1 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -11,7 +11,8 @@ public enum ExceptionCode {
         NO_SUCH_STATION,
         NO_SUCH_LINE,
         NON_NUMBER_INPUT,
-        OUT_OF_LINE_RANGE;
+        OUT_OF_LINE_RANGE,
+        NO_LINK_AVAILABLE;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -39,6 +40,8 @@ public String getMessage() {
             return HEADER + "순서는 숫자로 입력해야 합니다.";
         if (exceptionCode.equals(ExceptionCode.OUT_OF_LINE_RANGE))
             return HEADER + "순서는 해당 노선의 범위 안에서 입력해야 합니다.";
+        if (exceptionCode.equals(ExceptionCode.NO_LINK_AVAILABLE))
+            return HEADER + "역이 두 개 이하인 노선은 삭제할 수 없습니다";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index a82399689..681590399 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -10,6 +10,7 @@
 
 import java.util.Scanner;
 
+import static subway.constant.Constant.MIN_LINE_LENGTH;
 import static subway.constant.Constant.MIN_ORDER;
 
 public class LinkService extends CrudService {
@@ -93,6 +94,7 @@ private void addNewLink(Link newLink) {
     public void delete() {
         Link targetLink = getTargetLinkInput();
         validateTargetLink(targetLink);
+        deleteTargetLink(targetLink);
         System.out.println(Information.DELETE_LINK_SUCCESS);
     }
 
@@ -115,8 +117,21 @@ private String getTargetStationNameOnDelete() {
     private void validateTargetLink(Link targetLink) {
         validateLineExists(targetLink.getLineName());
         validateStationExists(targetLink.getStationName());
+        validateLineLength(targetLink.getLineName());
     }
 
+    private void validateLineLength(String lineName) {
+        Line targetLine = getTargetLine(lineName);
+        if (targetLine.getStations().size() < MIN_LINE_LENGTH)
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_LINK_AVAILABLE);
+    }
+
+    private void deleteTargetLink(Link targetLink) {
+        Line targetLine = getTargetLine(targetLink.getLineName());
+        targetLine.deleteTargetLink(targetLink);
+    }
+
+
     @Override
     public void show() {
         throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_FUNCTION_CODE);

From 32746266509951bbfb622128765a2690e8ff17e4 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 01:02:38 +0900
Subject: [PATCH 36/51] feat(station): check station deletable on delete

---
 README.md                                     |  5 +--
 .../exception/InvalidInputException.java      |  5 ++-
 .../java/subway/service/StationService.java   | 31 +++++++++++++++++++
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 7c03a79a5..3a92e8a06 100644
--- a/README.md
+++ b/README.md
@@ -497,13 +497,14 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
     - [x] 사용자 입력이 Q인 경우 프로그램을 완전 종료한다.
     - [x] 사전등록정보에 따라 지하철 노선도를 초기화한다.
-- [ ] 역 관리
+- [x] 역 관리
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
     - [x] 사용자 입력에 따라 하위 기능을 실행한다.
     - [x] 역 조회 시 모든 역의 이름을 중복 없이 출력한다.
     - [x] 역 등록 시 이름 중복을 확인한다.
     - [x] 역 등록 시 이름이 2글자 이상인지 확인한다.
-    - [ ] 역 삭제 시 노선에 등록된 역인지 확인한다.
+    - [x] 역 삭제 시 존재하는 역인지 확인한다.
+    - [x] 역 삭제 시 노선에 등록된 역인지 확인한다.
 - [x] 노선 관리
     - [x] 하위 기능을 선택한다. (역 관리와 동일)
     - [x] 노선 조회 시 모든 노선의 이름을 중복 없이 출력한다.
diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index f49151cd1..8ed3fb0ee 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -12,7 +12,8 @@ public enum ExceptionCode {
         NO_SUCH_LINE,
         NON_NUMBER_INPUT,
         OUT_OF_LINE_RANGE,
-        NO_LINK_AVAILABLE;
+        NO_LINK_AVAILABLE,
+        STATION_LINKED;
     }
 
     private final String HEADER = "\n[ERROR] ";
@@ -42,6 +43,8 @@ public String getMessage() {
             return HEADER + "순서는 해당 노선의 범위 안에서 입력해야 합니다.";
         if (exceptionCode.equals(ExceptionCode.NO_LINK_AVAILABLE))
             return HEADER + "역이 두 개 이하인 노선은 삭제할 수 없습니다";
+        if (exceptionCode.equals(ExceptionCode.STATION_LINKED))
+            return HEADER + "노선에 연결된 역은 삭제할 수 없습니다";
         return "";
     }
 }
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 20517083e..87fe80766 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -3,12 +3,15 @@
 import subway.constant.Constant;
 import subway.constant.Information;
 import subway.constant.InitialData;
+import subway.domain.Line;
 import subway.domain.Station;
 import subway.exception.InvalidInputException;
+import subway.repository.LineRepository;
 import subway.repository.StationRepository;
 
 import java.util.Scanner;
 
+import static subway.constant.Information.DELETE_STATION_SUCCESS;
 import static subway.constant.Information.INFO_HEADER;
 
 public class StationService extends CrudService {
@@ -57,7 +60,35 @@ private void validateDuplicateStation(Station newStation) {
 
     @Override
     public void delete() {
+        Station targetStation = getTargetStationInput();
+        validateTargetStation(targetStation);
+        StationRepository.deleteStation(targetStation.getName());
+        System.out.println(DELETE_STATION_SUCCESS);
+    }
+
+    private Station getTargetStationInput() {
         System.out.println(Information.DELETE_STATION_INFO);
+        return new Station(scanner.nextLine());
+    }
+
+    private void validateTargetStation(Station targetStation) {
+        validateTargetStationExists(targetStation);
+        validateTargetStationIsNotLinked(targetStation);
+    }
+
+    private void validateTargetStationExists(Station targetStation) {
+        if (!StationRepository.stations().contains(targetStation))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
+    }
+
+    private void validateTargetStationIsNotLinked(Station targetStation) {
+        for (Line line : LineRepository.lines())
+            validateTargetStationIsNotInLine(line, targetStation);
+    }
+
+    private void validateTargetStationIsNotInLine(Line line, Station targetStation) {
+        if (line.getStations().contains(targetStation))
+            throw new InvalidInputException(InvalidInputException.ExceptionCode.STATION_LINKED);
     }
 
 

From 459cea1b6180e22518a43fc9d96f597fa6580e3c Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 01:08:48 +0900
Subject: [PATCH 37/51] feat(print): print all lines and stations

---
 README.md                                     |  2 ++
 src/main/java/subway/constant/Constant.java   |  1 +
 .../java/subway/service/PrintService.java     | 23 ++++++++++++++++++-
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 3a92e8a06..72da140db 100644
--- a/README.md
+++ b/README.md
@@ -525,3 +525,5 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 삭제 시 존재하는 역인지 확인한다.
     - [x] 구간 삭제 시 노선에 남은 역이 2개 초과인지 확인한다.
     - [x] 구간 삭제 시 상하행 종점역을 갱신한다.
+- [x] 지하철 노선도
+    - [x] 모든 노선과 역을 순서대로 출력한다.
diff --git a/src/main/java/subway/constant/Constant.java b/src/main/java/subway/constant/Constant.java
index 291d2d3c9..8e9d5073a 100644
--- a/src/main/java/subway/constant/Constant.java
+++ b/src/main/java/subway/constant/Constant.java
@@ -5,4 +5,5 @@ public class Constant {
     public static final int MIN_NAME_LENGTH = 2;
     public static final int MIN_ORDER = 0;
     public static final int MIN_LINE_LENGTH = 3;
+    public static final String LINE = "---";
 }
diff --git a/src/main/java/subway/service/PrintService.java b/src/main/java/subway/service/PrintService.java
index 5491e5f60..286122d6e 100644
--- a/src/main/java/subway/service/PrintService.java
+++ b/src/main/java/subway/service/PrintService.java
@@ -1,10 +1,31 @@
 package subway.service;
 
 import subway.constant.Information;
+import subway.domain.Line;
+import subway.domain.Station;
+import subway.repository.LineRepository;
+
+import static subway.constant.Constant.LINE;
+import static subway.constant.Information.INFO_HEADER;
 
 public class PrintService {
 
     public void run() {
-        System.out.println(Information.PRINT_INFO);
+        System.out.print(Information.PRINT_INFO);
+        printLines();
+    }
+
+    private void printLines() {
+        for (Line line : LineRepository.lines()) {
+            printLine(line);
+            System.out.println();
+        }
+    }
+
+    private void printLine(Line line) {
+        System.out.print(INFO_HEADER + line.getName());
+        System.out.print(INFO_HEADER + LINE);
+        for (Station station : line.getStations())
+            System.out.print(INFO_HEADER + station.getName());
     }
 }

From 9e611b94167cee28238ccc5c4db881b027576a86 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 01:18:56 +0900
Subject: [PATCH 38/51] feat(line): add stations with line on add

---
 README.md                                     |  1 +
 src/main/java/subway/service/LineService.java | 20 +++++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 72da140db..66371b03c 100644
--- a/README.md
+++ b/README.md
@@ -512,6 +512,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 노선 등록 시 이름이 2글자 이상인지 확인한다.
     - [x] 노선 등록 시 상행 종점역이 존재하는 역인지 확인한다.
     - [x] 노선 등록 시 하행 종점역이 존재하는 역인지 확인한다.
+    - [x] 노선 등록 시 상하행 종점역을 역 리스트에 추가한다.
     - [x] 노선 삭제 시 존재하는 노선인지 확인한다.
 - [x] 구간 관리
     - [x] 선택지에 없는 입력일 시 에러메세지를 출력한다.
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index a35d468cf..144a3e952 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -9,6 +9,9 @@
 import subway.repository.LineRepository;
 import subway.repository.StationRepository;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
 import java.util.Scanner;
 
 import static subway.constant.Information.INFO_HEADER;
@@ -32,15 +35,14 @@ private void initLines() {
     public void add() {
         Line newLine = getNewLineInput();
         validateNewLine(newLine);
-        LineRepository.addLine(newLine);
+        addNewLine(newLine);
         System.out.println(Information.ADD_LINE_SUCCESS);
     }
 
     private Line getNewLineInput() {
         String name = getNewLineName();
-        Station upEnd = getNewLineUpEnd();
-        Station downEnd = getNewLineDownEnd();
-        Line newLine = new Line(name, upEnd, downEnd);
+        List<Station> endStations = getNewLineEndStations();
+        Line newLine = new Line(name, endStations);
         validateNewLine(newLine);
         return newLine;
     }
@@ -50,6 +52,12 @@ private String getNewLineName() {
         return scanner.nextLine();
     }
 
+    private List<Station> getNewLineEndStations() {
+        Station upEnd = getNewLineUpEnd();
+        Station downEnd = getNewLineDownEnd();
+        return new ArrayList<>(Arrays.asList(upEnd, downEnd));
+    }
+
     private Station getNewLineUpEnd() {
         System.out.println(Information.ADD_LINE_INFO_UP_END);
         return new Station(scanner.nextLine());
@@ -82,6 +90,10 @@ private void validateEndStationsExist(Line newLine) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
     }
 
+    private void addNewLine(Line newLine) {
+        LineRepository.addLine(newLine);
+    }
+
 
     @Override
     public void delete() {

From a04bb464ee7008133b4c69c018bbec51476b7ba9 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 01:51:06 +0900
Subject: [PATCH 39/51] refactor: realign exception class

---
 .../exception/InvalidInputException.java      | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 8ed3fb0ee..f7ed2b956 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -2,26 +2,26 @@
 
 public class InvalidInputException extends RuntimeException {
 
+    private final String HEADER = "\n[ERROR] ";
+    private ExceptionCode exceptionCode;
+
+    public InvalidInputException(ExceptionCode exceptionCode) {
+        this.exceptionCode = exceptionCode;
+    }
+
     public enum ExceptionCode {
         INVALID_SERVICE_CODE,
         INVALID_FUNCTION_CODE,
         DUPLICATE_STATION,
         DUPLICATE_LINE,
-        INVALID_NAME_LENGTH,
         NO_SUCH_STATION,
         NO_SUCH_LINE,
+        INVALID_NAME_LENGTH,
         NON_NUMBER_INPUT,
         OUT_OF_LINE_RANGE,
         NO_LINK_AVAILABLE,
         STATION_LINKED;
-    }
 
-    private final String HEADER = "\n[ERROR] ";
-
-    private ExceptionCode exceptionCode;
-
-    public InvalidInputException(ExceptionCode exceptionCode) {
-        this.exceptionCode = exceptionCode;
     }
 
     public String getMessage() {
@@ -31,12 +31,12 @@ public String getMessage() {
             return HEADER + "이미 등록된 역 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.DUPLICATE_LINE))
             return HEADER + "이미 등록된 노선 이름입니다.";
-        if (exceptionCode.equals(ExceptionCode.INVALID_NAME_LENGTH))
-            return HEADER + "이름은 두 글자 이상이어야 합니다.";
         if (exceptionCode.equals(ExceptionCode.NO_SUCH_STATION))
             return HEADER + "존재하지 않는 역 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.NO_SUCH_LINE))
             return HEADER + "존재하지 않는 노선 이름입니다.";
+        if (exceptionCode.equals(ExceptionCode.INVALID_NAME_LENGTH))
+            return HEADER + "이름은 두 글자 이상이어야 합니다.";
         if (exceptionCode.equals(ExceptionCode.NON_NUMBER_INPUT))
             return HEADER + "순서는 숫자로 입력해야 합니다.";
         if (exceptionCode.equals(ExceptionCode.OUT_OF_LINE_RANGE))

From 8fb75e3921702e17db7515516fa64d67c9baea5a Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 01:57:56 +0900
Subject: [PATCH 40/51] refactor: remove unused constructor

---
 src/main/java/subway/domain/Line.java | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index abcba6982..d2c29c9be 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -18,12 +18,6 @@ public Line(String name) {
         this.name = name;
     }
 
-    public Line(String name, Station upEnd, Station downEnd) {
-        this.name = name;
-        this.upEnd = upEnd;
-        this.downEnd = downEnd;
-    }
-
     public Line(String name, List<Station> stations) {
         this.name = name;
         this.stations = stations;

From 5c3f57485e227173e54e83d8eee5022bd252889e Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:01:03 +0900
Subject: [PATCH 41/51] style: realign

---
 src/main/java/subway/domain/Line.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/subway/domain/Line.java b/src/main/java/subway/domain/Line.java
index d2c29c9be..837aea7cf 100644
--- a/src/main/java/subway/domain/Line.java
+++ b/src/main/java/subway/domain/Line.java
@@ -11,7 +11,6 @@ public class Line {
     private String name;
     private Station upEnd;
     private Station downEnd;
-
     private List<Station> stations = new ArrayList<>();
 
     public Line(String name) {
@@ -58,6 +57,7 @@ public int hashCode() {
         return Objects.hash(name);
     }
 
+
     public void addNewLink(Link newLink) {
         Station station = new Station(newLink.getStationName());
         int targetIndex = newLink.getOrder();

From e8524cfa87bc021f30ead48bd43b1a69de70d332 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:07:17 +0900
Subject: [PATCH 42/51] refactor: rename constants

---
 src/main/java/subway/constant/Constant.java   | 2 +-
 src/main/java/subway/constant/Service.java    | 2 +-
 src/main/java/subway/service/LinkService.java | 4 ++--
 src/main/java/subway/service/MainService.java | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/main/java/subway/constant/Constant.java b/src/main/java/subway/constant/Constant.java
index 8e9d5073a..1cffd535d 100644
--- a/src/main/java/subway/constant/Constant.java
+++ b/src/main/java/subway/constant/Constant.java
@@ -4,6 +4,6 @@ public class Constant {
 
     public static final int MIN_NAME_LENGTH = 2;
     public static final int MIN_ORDER = 0;
-    public static final int MIN_LINE_LENGTH = 3;
+    public static final int MIN_STATIONS_IN_LINE = 3;
     public static final String LINE = "---";
 }
diff --git a/src/main/java/subway/constant/Service.java b/src/main/java/subway/constant/Service.java
index b5c45f1da..d0162f949 100644
--- a/src/main/java/subway/constant/Service.java
+++ b/src/main/java/subway/constant/Service.java
@@ -10,7 +10,7 @@ public enum Service {
     STATION("1"),
     LINE("2"),
     LINK("3"),
-    MAP("4"),
+    PRINT("4"),
     QUIT("Q");
 
     private static List<String> serviceCodes = new ArrayList<>();
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 681590399..ebde0b366 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -10,7 +10,7 @@
 
 import java.util.Scanner;
 
-import static subway.constant.Constant.MIN_LINE_LENGTH;
+import static subway.constant.Constant.MIN_STATIONS_IN_LINE;
 import static subway.constant.Constant.MIN_ORDER;
 
 public class LinkService extends CrudService {
@@ -122,7 +122,7 @@ private void validateTargetLink(Link targetLink) {
 
     private void validateLineLength(String lineName) {
         Line targetLine = getTargetLine(lineName);
-        if (targetLine.getStations().size() < MIN_LINE_LENGTH)
+        if (targetLine.getStations().size() < MIN_STATIONS_IN_LINE)
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_LINK_AVAILABLE);
     }
 
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 8daf2d31d..40fa3b7fd 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -57,7 +57,7 @@ private void runSelectedService(String selectedService) {
             lineService.run();
         if (selectedService.equals(Service.LINK.getCode()))
             linkService.run();
-        if (selectedService.equals(Service.MAP.getCode()))
+        if (selectedService.equals(Service.PRINT.getCode()))
             printService.run();
         if (selectedService.equals(Service.QUIT.getCode()))
             isContinue = false;

From 623283db0f1920bc4537f5a02b7696fa57726db5 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:10:15 +0900
Subject: [PATCH 43/51] refactor: rename constant

---
 .../exception/InvalidInputException.java      | 22 +++++++++----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index f7ed2b956..1acb5858c 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -2,7 +2,7 @@
 
 public class InvalidInputException extends RuntimeException {
 
-    private final String HEADER = "\n[ERROR] ";
+    private final String ERROR_HEADER = "\n[ERROR] ";
     private ExceptionCode exceptionCode;
 
     public InvalidInputException(ExceptionCode exceptionCode) {
@@ -26,25 +26,25 @@ public enum ExceptionCode {
 
     public String getMessage() {
         if (exceptionCode.equals(ExceptionCode.INVALID_SERVICE_CODE) || exceptionCode.equals(ExceptionCode.INVALID_FUNCTION_CODE))
-            return HEADER + "선택할 수 없는 기능입니다.";
+            return ERROR_HEADER + "선택할 수 없는 기능입니다.";
         if (exceptionCode.equals(ExceptionCode.DUPLICATE_STATION))
-            return HEADER + "이미 등록된 역 이름입니다.";
+            return ERROR_HEADER + "이미 등록된 역 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.DUPLICATE_LINE))
-            return HEADER + "이미 등록된 노선 이름입니다.";
+            return ERROR_HEADER + "이미 등록된 노선 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.NO_SUCH_STATION))
-            return HEADER + "존재하지 않는 역 이름입니다.";
+            return ERROR_HEADER + "존재하지 않는 역 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.NO_SUCH_LINE))
-            return HEADER + "존재하지 않는 노선 이름입니다.";
+            return ERROR_HEADER + "존재하지 않는 노선 이름입니다.";
         if (exceptionCode.equals(ExceptionCode.INVALID_NAME_LENGTH))
-            return HEADER + "이름은 두 글자 이상이어야 합니다.";
+            return ERROR_HEADER + "이름은 두 글자 이상이어야 합니다.";
         if (exceptionCode.equals(ExceptionCode.NON_NUMBER_INPUT))
-            return HEADER + "순서는 숫자로 입력해야 합니다.";
+            return ERROR_HEADER + "순서는 숫자로 입력해야 합니다.";
         if (exceptionCode.equals(ExceptionCode.OUT_OF_LINE_RANGE))
-            return HEADER + "순서는 해당 노선의 범위 안에서 입력해야 합니다.";
+            return ERROR_HEADER + "순서는 해당 노선의 범위 안에서 입력해야 합니다.";
         if (exceptionCode.equals(ExceptionCode.NO_LINK_AVAILABLE))
-            return HEADER + "역이 두 개 이하인 노선은 삭제할 수 없습니다";
+            return ERROR_HEADER + "역이 두 개 이하인 노선은 삭제할 수 없습니다";
         if (exceptionCode.equals(ExceptionCode.STATION_LINKED))
-            return HEADER + "노선에 연결된 역은 삭제할 수 없습니다";
+            return ERROR_HEADER + "노선에 연결된 역은 삭제할 수 없습니다";
         return "";
     }
 }

From e50914ad3905df94ba6de3ccdfee76c78ee73a4b Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:10:59 +0900
Subject: [PATCH 44/51] refactor: rename method

---
 src/main/java/subway/repository/LineRepository.java    | 1 +
 src/main/java/subway/repository/StationRepository.java | 3 ++-
 src/main/java/subway/service/StationService.java       | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/java/subway/repository/LineRepository.java b/src/main/java/subway/repository/LineRepository.java
index 9d8ef80bc..9b4fb40d0 100644
--- a/src/main/java/subway/repository/LineRepository.java
+++ b/src/main/java/subway/repository/LineRepository.java
@@ -8,6 +8,7 @@
 import java.util.Objects;
 
 public class LineRepository {
+
     private static final List<Line> lines = new ArrayList<>();
 
     public static List<Line> lines() {
diff --git a/src/main/java/subway/repository/StationRepository.java b/src/main/java/subway/repository/StationRepository.java
index 067c33c2e..720e98012 100644
--- a/src/main/java/subway/repository/StationRepository.java
+++ b/src/main/java/subway/repository/StationRepository.java
@@ -8,6 +8,7 @@
 import java.util.Objects;
 
 public class StationRepository {
+
     private static final List<Station> stations = new ArrayList<>();
 
     public static List<Station> stations() {
@@ -23,7 +24,7 @@ public static void addStation(List<Station> stations) {
             addStation(station);
     }
 
-    public static boolean deleteStation(String name) {
+    public static boolean deleteStationByName(String name) {
         return stations.removeIf(station -> Objects.equals(station.getName(), name));
     }
 }
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 87fe80766..2255a80e4 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -62,7 +62,7 @@ private void validateDuplicateStation(Station newStation) {
     public void delete() {
         Station targetStation = getTargetStationInput();
         validateTargetStation(targetStation);
-        StationRepository.deleteStation(targetStation.getName());
+        StationRepository.deleteStationByName(targetStation.getName());
         System.out.println(DELETE_STATION_SUCCESS);
     }
 

From 4b99d669a7a55dd32b71f435aeae62a739a0553b Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:35:38 +0900
Subject: [PATCH 45/51] refactor: rename methods in services

---
 src/main/java/subway/service/CrudService.java  | 14 +++++++-------
 src/main/java/subway/service/LineService.java  | 18 ++++++------------
 src/main/java/subway/service/LinkService.java  | 18 +++++++++---------
 src/main/java/subway/service/MainService.java  |  4 ++++
 src/main/java/subway/service/PrintService.java |  3 ++-
 .../java/subway/service/StationService.java    |  4 ++--
 6 files changed, 30 insertions(+), 31 deletions(-)

diff --git a/src/main/java/subway/service/CrudService.java b/src/main/java/subway/service/CrudService.java
index 420e7661c..cfd46fa28 100644
--- a/src/main/java/subway/service/CrudService.java
+++ b/src/main/java/subway/service/CrudService.java
@@ -8,11 +8,11 @@
 public abstract class CrudService implements MapService {
 
     private Scanner scanner;
-    private String info;
+    private String information;
 
-    public CrudService(Scanner scanner, String info) {
+    public CrudService(Scanner scanner, String information) {
         this.scanner = scanner;
-        this.info = info;
+        this.information = information;
     }
 
     @Override
@@ -26,13 +26,13 @@ public void run() {
     }
 
     private String selectFunction() {
-        String line = getFunctionInput();
-        Function.validate(line);
-        return line;
+        String input = getFunctionInput();
+        Function.validate(input);
+        return input;
     }
 
     private String getFunctionInput() {
-        System.out.println(info);
+        System.out.println(information);
         return scanner.nextLine();
     }
 
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index 144a3e952..d4d51af89 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -35,16 +35,14 @@ private void initLines() {
     public void add() {
         Line newLine = getNewLineInput();
         validateNewLine(newLine);
-        addNewLine(newLine);
+        LineRepository.addLine(newLine);
         System.out.println(Information.ADD_LINE_SUCCESS);
     }
 
     private Line getNewLineInput() {
         String name = getNewLineName();
         List<Station> endStations = getNewLineEndStations();
-        Line newLine = new Line(name, endStations);
-        validateNewLine(newLine);
-        return newLine;
+        return new Line(name, endStations);
     }
 
     private String getNewLineName() {
@@ -70,7 +68,7 @@ private Station getNewLineDownEnd() {
 
     private void validateNewLine(Line newLine) {
         validateNameLength(newLine);
-        validateDuplicateLine(newLine);
+        validateDuplicateLineExists(newLine);
         validateEndStationsExist(newLine);
     }
 
@@ -79,7 +77,7 @@ private void validateNameLength(Line newLine) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_NAME_LENGTH);
     }
 
-    private void validateDuplicateLine(Line newLine) {
+    private void validateDuplicateLineExists(Line newLine) {
         if (LineRepository.lines().contains(newLine))
             throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_LINE);
     }
@@ -90,15 +88,11 @@ private void validateEndStationsExist(Line newLine) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_STATION);
     }
 
-    private void addNewLine(Line newLine) {
-        LineRepository.addLine(newLine);
-    }
-
 
     @Override
     public void delete() {
         String targetLineName = getTargetLineName();
-        validateLineExists(targetLineName);
+        validateTargetLine(targetLineName);
         LineRepository.deleteLineByName(targetLineName);
         System.out.println(Information.DELETE_LINE_SUCCESS);
     }
@@ -108,7 +102,7 @@ private String getTargetLineName() {
         return scanner.nextLine();
     }
 
-    private void validateLineExists(String targetLineName) {
+    private void validateTargetLine(String targetLineName) {
         Line targetLine = new Line(targetLineName);
         if (!LineRepository.lines().contains(targetLine))
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_SUCH_LINE);
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index ebde0b366..4d5848705 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -10,8 +10,8 @@
 
 import java.util.Scanner;
 
-import static subway.constant.Constant.MIN_STATIONS_IN_LINE;
 import static subway.constant.Constant.MIN_ORDER;
+import static subway.constant.Constant.MIN_STATIONS_IN_LINE;
 
 public class LinkService extends CrudService {
 
@@ -28,6 +28,7 @@ public void add() {
             Link newLink = getNewLinkInput();
             validateNewLink(newLink);
             addNewLink(newLink);
+            System.out.println(Information.ADD_LINK_SUCCESS);
         } catch (NumberFormatException e) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NON_NUMBER_INPUT);
         }
@@ -36,7 +37,7 @@ public void add() {
     private Link getNewLinkInput() throws NumberFormatException {
         String lineName = getLineNameOnAdd();
         String stationName = getStationNameOnAdd();
-        int order = getOrder();
+        int order = getOrderOnAdd();
         return new Link(lineName, stationName, order);
     }
 
@@ -50,7 +51,7 @@ private String getStationNameOnAdd() {
         return scanner.nextLine();
     }
 
-    private int getOrder() throws NumberFormatException {
+    private int getOrderOnAdd() throws NumberFormatException {
         System.out.println(Information.ADD_LINK_INFO_ORDER);
         return Integer.parseInt(scanner.nextLine()) - 1;
     }
@@ -74,19 +75,18 @@ private void validateStationExists(String stationName) {
     }
 
     private void validateOrderInRange(Link newLink) {
-        Line line = getTargetLine(newLink.getLineName());
+        Line line = getTargetLineByName(newLink.getLineName());
         if (newLink.getOrder() < MIN_ORDER || newLink.getOrder() > line.getStations().size())
             throw new InvalidInputException(InvalidInputException.ExceptionCode.OUT_OF_LINE_RANGE);
     }
 
-    private Line getTargetLine(String lineName) {
+    private Line getTargetLineByName(String lineName) {
         return LineRepository.getLineByName(lineName);
     }
 
     private void addNewLink(Link newLink) {
-        Line line = getTargetLine(newLink.getLineName());
+        Line line = getTargetLineByName(newLink.getLineName());
         line.addNewLink(newLink);
-        System.out.println(Information.ADD_LINK_SUCCESS);
     }
 
 
@@ -121,13 +121,13 @@ private void validateTargetLink(Link targetLink) {
     }
 
     private void validateLineLength(String lineName) {
-        Line targetLine = getTargetLine(lineName);
+        Line targetLine = getTargetLineByName(lineName);
         if (targetLine.getStations().size() < MIN_STATIONS_IN_LINE)
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NO_LINK_AVAILABLE);
     }
 
     private void deleteTargetLink(Link targetLink) {
-        Line targetLine = getTargetLine(targetLink.getLineName());
+        Line targetLine = getTargetLineByName(targetLink.getLineName());
         targetLine.deleteTargetLink(targetLink);
     }
 
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 40fa3b7fd..e9b06d74f 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -18,6 +18,10 @@ public class MainService {
 
     public MainService(Scanner scanner) {
         this.scanner = scanner;
+        initServices(scanner);
+    }
+
+    private void initServices(Scanner scanner) {
         stationService = new StationService(scanner);
         lineService = new LineService(scanner);
         linkService = new LinkService(scanner);
diff --git a/src/main/java/subway/service/PrintService.java b/src/main/java/subway/service/PrintService.java
index 286122d6e..374bb5c10 100644
--- a/src/main/java/subway/service/PrintService.java
+++ b/src/main/java/subway/service/PrintService.java
@@ -8,8 +8,9 @@
 import static subway.constant.Constant.LINE;
 import static subway.constant.Information.INFO_HEADER;
 
-public class PrintService {
+public class PrintService implements MapService {
 
+    @Override
     public void run() {
         System.out.print(Information.PRINT_INFO);
         printLines();
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index 2255a80e4..b6837ea3a 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -44,7 +44,7 @@ private Station getNewStationInput() {
 
     private void validateNewStation(Station newStation) {
         validateNameLength(newStation);
-        validateDuplicateStation(newStation);
+        validateDuplicateStationExists(newStation);
     }
 
     private void validateNameLength(Station newStation) {
@@ -52,7 +52,7 @@ private void validateNameLength(Station newStation) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.INVALID_NAME_LENGTH);
     }
 
-    private void validateDuplicateStation(Station newStation) {
+    private void validateDuplicateStationExists(Station newStation) {
         if (StationRepository.stations().contains(newStation))
             throw new InvalidInputException(InvalidInputException.ExceptionCode.DUPLICATE_STATION);
     }

From 8a2af762476f2d2529558c99d7a433e70c5b28f3 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:38:09 +0900
Subject: [PATCH 46/51] style: remove empty line

---
 src/main/java/subway/exception/InvalidInputException.java | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/main/java/subway/exception/InvalidInputException.java b/src/main/java/subway/exception/InvalidInputException.java
index 1acb5858c..ddba858f8 100644
--- a/src/main/java/subway/exception/InvalidInputException.java
+++ b/src/main/java/subway/exception/InvalidInputException.java
@@ -21,7 +21,6 @@ public enum ExceptionCode {
         OUT_OF_LINE_RANGE,
         NO_LINK_AVAILABLE,
         STATION_LINKED;
-
     }
 
     public String getMessage() {

From 0873f9ce5f7f28da3de4a9c19326da1a88def900 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Sat, 12 Dec 2020 02:45:56 +0900
Subject: [PATCH 47/51] docs(readme): update the list to implement

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index 66371b03c..f44cb1dc7 100644
--- a/README.md
+++ b/README.md
@@ -528,3 +528,5 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 삭제 시 상하행 종점역을 갱신한다.
 - [x] 지하철 노선도
     - [x] 모든 노선과 역을 순서대로 출력한다.
+- [ ] 리팩토링
+    - [ ] 비즈니스 로직과 UI 로직을 분리한다.
\ No newline at end of file

From 1e10619ced40e20fbd4b8e9bedf076868d734bb5 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Tue, 15 Dec 2020 22:39:12 +0900
Subject: [PATCH 48/51] refactor: add views and move UI logic from service to
 view

---
 README.md                                     |   4 +-
 src/main/java/subway/constant/Constant.java   |   2 +-
 .../java/subway/constant/Information.java     |   2 +-
 src/main/java/subway/service/CrudService.java |  36 +++---
 src/main/java/subway/service/LineService.java |  63 ++--------
 src/main/java/subway/service/LinkService.java |  59 ++-------
 src/main/java/subway/service/MainService.java |  42 +++----
 .../java/subway/service/PrintService.java     |  29 ++---
 .../java/subway/service/StationService.java   |  35 ++----
 src/main/java/subway/view/InputView.java      | 119 ++++++++++++++++++
 src/main/java/subway/view/OutputView.java     |  57 +++++++++
 11 files changed, 255 insertions(+), 193 deletions(-)
 create mode 100644 src/main/java/subway/view/InputView.java
 create mode 100644 src/main/java/subway/view/OutputView.java

diff --git a/README.md b/README.md
index f44cb1dc7..0378dce63 100644
--- a/README.md
+++ b/README.md
@@ -529,4 +529,6 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
 - [x] 지하철 노선도
     - [x] 모든 노선과 역을 순서대로 출력한다.
 - [ ] 리팩토링
-    - [ ] 비즈니스 로직과 UI 로직을 분리한다.
\ No newline at end of file
+    - [x] 비즈니스 로직과 UI 로직을 분리한다.
+    - [ ] InputView를 통해 사용자 입력을 받는다.
+    - [ ] OutputView를 통해 안내 문구와 결과를 출력한다.
\ No newline at end of file
diff --git a/src/main/java/subway/constant/Constant.java b/src/main/java/subway/constant/Constant.java
index 1cffd535d..9930e8aba 100644
--- a/src/main/java/subway/constant/Constant.java
+++ b/src/main/java/subway/constant/Constant.java
@@ -5,5 +5,5 @@ public class Constant {
     public static final int MIN_NAME_LENGTH = 2;
     public static final int MIN_ORDER = 0;
     public static final int MIN_STATIONS_IN_LINE = 3;
-    public static final String LINE = "---";
+    public static final String DIVIDER = "---";
 }
diff --git a/src/main/java/subway/constant/Information.java b/src/main/java/subway/constant/Information.java
index ecb975e41..44005634d 100644
--- a/src/main/java/subway/constant/Information.java
+++ b/src/main/java/subway/constant/Information.java
@@ -2,7 +2,7 @@
 
 public class Information {
 
-    public static final String INFO_HEADER = "\n[INFO] ";
+    public static final String INFO_HEADER = "[INFO] ";
 
     public static final String CHOOSE_FUNCTION = "\n## 원하는 기능을 선택하세요.";
     public static final String MAIN_INFO = "\n## 메인 화면\n1. 역 관리\n2. 노선 관리\n3. 구간 관리\n4. 지하철 노선도 출력\nQ. 종료\n" + CHOOSE_FUNCTION;
diff --git a/src/main/java/subway/service/CrudService.java b/src/main/java/subway/service/CrudService.java
index cfd46fa28..3db5a26e7 100644
--- a/src/main/java/subway/service/CrudService.java
+++ b/src/main/java/subway/service/CrudService.java
@@ -2,40 +2,40 @@
 
 import subway.constant.Function;
 import subway.exception.InvalidInputException;
-
-import java.util.Scanner;
+import subway.view.InputView;
+import subway.view.OutputView;
 
 public abstract class CrudService implements MapService {
 
-    private Scanner scanner;
+    private InputView inputView;
+    private OutputView outputView;
     private String information;
 
-    public CrudService(Scanner scanner, String information) {
-        this.scanner = scanner;
+    public CrudService(InputView inputView, OutputView outputView, String information) {
+        this.inputView = inputView;
+        this.outputView = outputView;
         this.information = information;
     }
 
+    public InputView getInputView() {
+        return inputView;
+    }
+
+    public OutputView getOutputView() {
+        return outputView;
+    }
+
     @Override
     public void run() {
         try {
-            String selectedFunction = selectFunction();
+            String selectedFunction = inputView.getFunctionInput(information);
+            Function.validate(selectedFunction);
             runSelectedFunction(selectedFunction);
         } catch (InvalidInputException e) {
-            System.out.println(e.getMessage());
+            outputView.printErrorMessage(e.getMessage());
         }
     }
 
-    private String selectFunction() {
-        String input = getFunctionInput();
-        Function.validate(input);
-        return input;
-    }
-
-    private String getFunctionInput() {
-        System.out.println(information);
-        return scanner.nextLine();
-    }
-
     private void runSelectedFunction(String selectedFunction) {
         if (selectedFunction.equals(Function.ADD.getCode()))
             add();
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index d4d51af89..13ffb4067 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -1,28 +1,20 @@
 package subway.service;
 
 import subway.constant.Constant;
-import subway.constant.Information;
 import subway.constant.InitialData;
 import subway.domain.Line;
-import subway.domain.Station;
 import subway.exception.InvalidInputException;
 import subway.repository.LineRepository;
 import subway.repository.StationRepository;
+import subway.view.InputView;
+import subway.view.OutputView;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Scanner;
-
-import static subway.constant.Information.INFO_HEADER;
+import static subway.constant.Information.*;
 
 public class LineService extends CrudService {
 
-    private Scanner scanner;
-
-    public LineService(Scanner scanner) {
-        super(scanner, Information.LINE_INFO);
-        this.scanner = scanner;
+    public LineService(InputView inputView, OutputView outputView) {
+        super(inputView, outputView, LINE_INFO);
         initLines();
     }
 
@@ -33,37 +25,10 @@ private void initLines() {
 
     @Override
     public void add() {
-        Line newLine = getNewLineInput();
+        Line newLine = getInputView().getNewLineInput();
         validateNewLine(newLine);
         LineRepository.addLine(newLine);
-        System.out.println(Information.ADD_LINE_SUCCESS);
-    }
-
-    private Line getNewLineInput() {
-        String name = getNewLineName();
-        List<Station> endStations = getNewLineEndStations();
-        return new Line(name, endStations);
-    }
-
-    private String getNewLineName() {
-        System.out.println(Information.ADD_LINE_INFO);
-        return scanner.nextLine();
-    }
-
-    private List<Station> getNewLineEndStations() {
-        Station upEnd = getNewLineUpEnd();
-        Station downEnd = getNewLineDownEnd();
-        return new ArrayList<>(Arrays.asList(upEnd, downEnd));
-    }
-
-    private Station getNewLineUpEnd() {
-        System.out.println(Information.ADD_LINE_INFO_UP_END);
-        return new Station(scanner.nextLine());
-    }
-
-    private Station getNewLineDownEnd() {
-        System.out.println(Information.ADD_LINE_INFO_DOWN_END);
-        return new Station(scanner.nextLine());
+        getOutputView().printInformation(ADD_LINE_SUCCESS);
     }
 
     private void validateNewLine(Line newLine) {
@@ -91,15 +56,10 @@ private void validateEndStationsExist(Line newLine) {
 
     @Override
     public void delete() {
-        String targetLineName = getTargetLineName();
+        String targetLineName = getInputView().getTargetLineNameInput();
         validateTargetLine(targetLineName);
         LineRepository.deleteLineByName(targetLineName);
-        System.out.println(Information.DELETE_LINE_SUCCESS);
-    }
-
-    private String getTargetLineName() {
-        System.out.println(Information.DELETE_LINE_INFO);
-        return scanner.nextLine();
+        getOutputView().printInformation(DELETE_LINE_SUCCESS);
     }
 
     private void validateTargetLine(String targetLineName) {
@@ -111,9 +71,6 @@ private void validateTargetLine(String targetLineName) {
 
     @Override
     public void show() {
-        System.out.print(Information.SHOW_LINE_INFO);
-        for (Line line : LineRepository.lines())
-            System.out.print(INFO_HEADER + line.getName());
-        System.out.println();
+        getOutputView().printLineList();
     }
 }
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 4d5848705..59e73da93 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -1,61 +1,36 @@
 package subway.service;
 
-import subway.constant.Information;
 import subway.domain.Line;
 import subway.domain.Link;
 import subway.domain.Station;
 import subway.exception.InvalidInputException;
 import subway.repository.LineRepository;
 import subway.repository.StationRepository;
-
-import java.util.Scanner;
+import subway.view.InputView;
+import subway.view.OutputView;
 
 import static subway.constant.Constant.MIN_ORDER;
 import static subway.constant.Constant.MIN_STATIONS_IN_LINE;
+import static subway.constant.Information.*;
 
 public class LinkService extends CrudService {
 
-    private Scanner scanner;
-
-    public LinkService(Scanner scanner) {
-        super(scanner, Information.LINK_INFO);
-        this.scanner = scanner;
+    public LinkService(InputView inputView, OutputView outputView) {
+        super(inputView, outputView, LINK_INFO);
     }
 
     @Override
     public void add() {
         try {
-            Link newLink = getNewLinkInput();
+            Link newLink = getInputView().getNewLinkInput();
             validateNewLink(newLink);
             addNewLink(newLink);
-            System.out.println(Information.ADD_LINK_SUCCESS);
+            getOutputView().printInformation(ADD_LINK_SUCCESS);
         } catch (NumberFormatException e) {
             throw new InvalidInputException(InvalidInputException.ExceptionCode.NON_NUMBER_INPUT);
         }
     }
 
-    private Link getNewLinkInput() throws NumberFormatException {
-        String lineName = getLineNameOnAdd();
-        String stationName = getStationNameOnAdd();
-        int order = getOrderOnAdd();
-        return new Link(lineName, stationName, order);
-    }
-
-    private String getLineNameOnAdd() {
-        System.out.println(Information.ADD_LINK_INFO_LINE);
-        return scanner.nextLine();
-    }
-
-    private String getStationNameOnAdd() {
-        System.out.println(Information.ADD_LINK_INFO_STATION);
-        return scanner.nextLine();
-    }
-
-    private int getOrderOnAdd() throws NumberFormatException {
-        System.out.println(Information.ADD_LINK_INFO_ORDER);
-        return Integer.parseInt(scanner.nextLine()) - 1;
-    }
-
     private void validateNewLink(Link newLink) {
         validateLineExists(newLink.getLineName());
         validateStationExists(newLink.getStationName());
@@ -92,26 +67,10 @@ private void addNewLink(Link newLink) {
 
     @Override
     public void delete() {
-        Link targetLink = getTargetLinkInput();
+        Link targetLink = getInputView().getTargetLinkInput();
         validateTargetLink(targetLink);
         deleteTargetLink(targetLink);
-        System.out.println(Information.DELETE_LINK_SUCCESS);
-    }
-
-    private Link getTargetLinkInput() {
-        String targetLineName = getTargetLineNameOnDelete();
-        String targetStationName = getTargetStationNameOnDelete();
-        return new Link(targetLineName, targetStationName);
-    }
-
-    private String getTargetLineNameOnDelete() {
-        System.out.println(Information.DELETE_LINK_INFO_LINE);
-        return scanner.nextLine();
-    }
-
-    private String getTargetStationNameOnDelete() {
-        System.out.println(Information.DELETE_LINK_INFO_STATION);
-        return scanner.nextLine();
+        getOutputView().printInformation(DELETE_LINK_SUCCESS);
     }
 
     private void validateTargetLink(Link targetLink) {
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index e9b06d74f..a0d53676c 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -1,31 +1,39 @@
 package subway.service;
 
-import subway.constant.Information;
 import subway.constant.Service;
 import subway.exception.InvalidInputException;
+import subway.view.InputView;
+import subway.view.OutputView;
 
 import java.util.Scanner;
 
 public class MainService {
 
-    private Scanner scanner;
     private boolean isContinue = true;
 
+    private InputView inputView;
+    private OutputView outputView;
+
     private StationService stationService;
     private LineService lineService;
     private LinkService linkService;
     private PrintService printService;
 
     public MainService(Scanner scanner) {
-        this.scanner = scanner;
-        initServices(scanner);
+        initViews(scanner);
+        initServices();
+    }
+
+    private void initServices() {
+        stationService = new StationService(inputView, outputView);
+        lineService = new LineService(inputView, outputView);
+        linkService = new LinkService(inputView, outputView);
+        printService = new PrintService(outputView);
     }
 
-    private void initServices(Scanner scanner) {
-        stationService = new StationService(scanner);
-        lineService = new LineService(scanner);
-        linkService = new LinkService(scanner);
-        printService = new PrintService();
+    private void initViews(Scanner scanner) {
+        this.inputView = new InputView(scanner);
+        this.outputView = new OutputView();
     }
 
 
@@ -36,24 +44,14 @@ public void start() {
 
     private void runService() {
         try {
-            String selectedService = selectService();
+            String selectedService = inputView.getSelectedServiceInput();
+            Service.validate(selectedService);
             runSelectedService(selectedService);
         } catch (InvalidInputException e) {
-            System.out.println(e.getMessage());
+            outputView.printErrorMessage(e.getMessage());
         }
     }
 
-    private String selectService() {
-        String line = getServiceInput();
-        Service.validate(line);
-        return line;
-    }
-
-    private String getServiceInput() {
-        System.out.println(Information.MAIN_INFO);
-        return scanner.nextLine();
-    }
-
     private void runSelectedService(String selectedService) {
         if (selectedService.equals(Service.STATION.getCode()))
             stationService.run();
diff --git a/src/main/java/subway/service/PrintService.java b/src/main/java/subway/service/PrintService.java
index 374bb5c10..365565e93 100644
--- a/src/main/java/subway/service/PrintService.java
+++ b/src/main/java/subway/service/PrintService.java
@@ -1,32 +1,17 @@
 package subway.service;
 
-import subway.constant.Information;
-import subway.domain.Line;
-import subway.domain.Station;
-import subway.repository.LineRepository;
-
-import static subway.constant.Constant.LINE;
-import static subway.constant.Information.INFO_HEADER;
+import subway.view.OutputView;
 
 public class PrintService implements MapService {
 
-    @Override
-    public void run() {
-        System.out.print(Information.PRINT_INFO);
-        printLines();
-    }
+    private OutputView outputView;
 
-    private void printLines() {
-        for (Line line : LineRepository.lines()) {
-            printLine(line);
-            System.out.println();
-        }
+    public PrintService(OutputView outputView) {
+        this.outputView = outputView;
     }
 
-    private void printLine(Line line) {
-        System.out.print(INFO_HEADER + line.getName());
-        System.out.print(INFO_HEADER + LINE);
-        for (Station station : line.getStations())
-            System.out.print(INFO_HEADER + station.getName());
+    @Override
+    public void run() {
+        outputView.printMap();
     }
 }
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index b6837ea3a..b82a59524 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -8,19 +8,16 @@
 import subway.exception.InvalidInputException;
 import subway.repository.LineRepository;
 import subway.repository.StationRepository;
+import subway.view.InputView;
+import subway.view.OutputView;
 
-import java.util.Scanner;
-
+import static subway.constant.Information.ADD_STATION_SUCCESS;
 import static subway.constant.Information.DELETE_STATION_SUCCESS;
-import static subway.constant.Information.INFO_HEADER;
 
 public class StationService extends CrudService {
 
-    private Scanner scanner;
-
-    public StationService(Scanner scanner) {
-        super(scanner, Information.STATION_INFO);
-        this.scanner = scanner;
+    public StationService(InputView inputView, OutputView outputView) {
+        super(inputView, outputView, Information.STATION_INFO);
         initStations();
     }
 
@@ -31,16 +28,12 @@ private void initStations() {
 
     @Override
     public void add() {
-        Station newStation = getNewStationInput();
+        Station newStation = getInputView().getNewStationInput();
         validateNewStation(newStation);
         StationRepository.addStation(newStation);
-        System.out.println(Information.ADD_STATION_SUCCESS);
+        getOutputView().printInformation(ADD_STATION_SUCCESS);
     }
 
-    private Station getNewStationInput() {
-        System.out.println(Information.ADD_STATION_INFO);
-        return new Station(scanner.nextLine());
-    }
 
     private void validateNewStation(Station newStation) {
         validateNameLength(newStation);
@@ -60,15 +53,10 @@ private void validateDuplicateStationExists(Station newStation) {
 
     @Override
     public void delete() {
-        Station targetStation = getTargetStationInput();
+        Station targetStation = getInputView().getTargetStationInput();
         validateTargetStation(targetStation);
         StationRepository.deleteStationByName(targetStation.getName());
-        System.out.println(DELETE_STATION_SUCCESS);
-    }
-
-    private Station getTargetStationInput() {
-        System.out.println(Information.DELETE_STATION_INFO);
-        return new Station(scanner.nextLine());
+        getOutputView().printInformation(DELETE_STATION_SUCCESS);
     }
 
     private void validateTargetStation(Station targetStation) {
@@ -94,9 +82,6 @@ private void validateTargetStationIsNotInLine(Line line, Station targetStation)
 
     @Override
     public void show() {
-        System.out.print(Information.SHOW_STATION_INFO);
-        for (Station station : StationRepository.stations())
-            System.out.print(INFO_HEADER + station.getName());
-        System.out.println();
+        getOutputView().printStationList();
     }
 }
diff --git a/src/main/java/subway/view/InputView.java b/src/main/java/subway/view/InputView.java
new file mode 100644
index 000000000..767dfa3a0
--- /dev/null
+++ b/src/main/java/subway/view/InputView.java
@@ -0,0 +1,119 @@
+package subway.view;
+
+import subway.domain.Line;
+import subway.domain.Link;
+import subway.domain.Station;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+
+import static subway.constant.Information.*;
+
+public class InputView {
+
+    private final Scanner scanner;
+
+    public InputView(Scanner scanner) {
+        this.scanner = scanner;
+    }
+
+    public String getFunctionInput(String information) {
+        System.out.println(information);
+        return scanner.nextLine();
+    }
+
+
+    public String getSelectedServiceInput() {
+        System.out.println(MAIN_INFO);
+        return scanner.nextLine();
+    }
+
+
+    public Station getNewStationInput() {
+        System.out.println(ADD_STATION_INFO);
+        return new Station(scanner.nextLine());
+    }
+
+
+    public Station getTargetStationInput() {
+        System.out.println(DELETE_STATION_INFO);
+        return new Station(scanner.nextLine());
+    }
+
+
+    public Line getNewLineInput() {
+        String name = getNewLineName();
+        List<Station> endStations = getNewLineEndStations();
+        return new Line(name, endStations);
+    }
+
+    private String getNewLineName() {
+        System.out.println(ADD_LINE_INFO);
+        return scanner.nextLine();
+    }
+
+    private List<Station> getNewLineEndStations() {
+        Station upEnd = getNewLineUpEnd();
+        Station downEnd = getNewLineDownEnd();
+        return new ArrayList<>(Arrays.asList(upEnd, downEnd));
+    }
+
+    private Station getNewLineUpEnd() {
+        System.out.println(ADD_LINE_INFO_UP_END);
+        return new Station(scanner.nextLine());
+    }
+
+    private Station getNewLineDownEnd() {
+        System.out.println(ADD_LINE_INFO_DOWN_END);
+        return new Station(scanner.nextLine());
+    }
+
+
+    public String getTargetLineNameInput() {
+        System.out.println(DELETE_LINE_INFO);
+        return scanner.nextLine();
+    }
+
+
+    public Link getNewLinkInput() throws NumberFormatException {
+        String lineName = getLineNameOnAdd();
+        String stationName = getStationNameOnAdd();
+        int order = getOrderOnAdd();
+        return new Link(lineName, stationName, order);
+    }
+
+    private String getLineNameOnAdd() {
+        System.out.println(ADD_LINK_INFO_LINE);
+        return scanner.nextLine();
+    }
+
+    private String getStationNameOnAdd() {
+        System.out.println(ADD_LINK_INFO_STATION);
+        return scanner.nextLine();
+    }
+
+    private int getOrderOnAdd() throws NumberFormatException {
+        System.out.println(ADD_LINK_INFO_ORDER);
+        return Integer.parseInt(scanner.nextLine()) - 1;
+    }
+
+
+    public Link getTargetLinkInput() {
+        String targetLineName = getTargetLineNameOnDelete();
+        String targetStationName = getTargetStationNameOnDelete();
+        return new Link(targetLineName, targetStationName);
+    }
+
+    private String getTargetLineNameOnDelete() {
+        System.out.println(DELETE_LINK_INFO_LINE);
+        return scanner.nextLine();
+    }
+
+    private String getTargetStationNameOnDelete() {
+        System.out.println(DELETE_LINK_INFO_STATION);
+        return scanner.nextLine();
+    }
+
+}
diff --git a/src/main/java/subway/view/OutputView.java b/src/main/java/subway/view/OutputView.java
new file mode 100644
index 000000000..482b21e3a
--- /dev/null
+++ b/src/main/java/subway/view/OutputView.java
@@ -0,0 +1,57 @@
+package subway.view;
+
+import subway.domain.Line;
+import subway.domain.Station;
+import subway.repository.LineRepository;
+import subway.repository.StationRepository;
+
+import static subway.constant.Constant.DIVIDER;
+import static subway.constant.Information.*;
+
+public class OutputView {
+
+    public void printErrorMessage(String message) {
+        print(message);
+    }
+
+    public void printInformation(String information) {
+        printEmptyLine();
+        print(information);
+    }
+
+    private void print(String message) {
+        System.out.println(message);
+    }
+
+    public void printStationList() {
+        print(SHOW_STATION_INFO);
+        for (Station station : StationRepository.stations())
+            print(INFO_HEADER + station.getName());
+    }
+
+    private void printEmptyLine() {
+        print("");
+    }
+
+    public void printLineList() {
+        print(SHOW_LINE_INFO);
+        for (Line line : LineRepository.lines())
+            print(INFO_HEADER + line.getName());
+    }
+
+
+    public void printMap() {
+        print(PRINT_INFO);
+        for (Line line : LineRepository.lines()) {
+            printLineAndItsStations(line);
+            printEmptyLine();
+        }
+    }
+
+    private void printLineAndItsStations(Line line) {
+        print(INFO_HEADER + line.getName());
+        print(INFO_HEADER + DIVIDER);
+        for (Station station : line.getStations())
+            print(INFO_HEADER + station.getName());
+    }
+}

From 0c9c82bfba4c1568f456eaae54bf7d827678ca7a Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Tue, 15 Dec 2020 22:59:03 +0900
Subject: [PATCH 49/51] style: realign code

---
 src/main/java/subway/Application.java         | 2 +-
 src/main/java/subway/service/CrudService.java | 8 ++++----
 src/main/java/subway/service/MainService.java | 5 +++--
 src/main/java/subway/view/InputView.java      | 8 ++++----
 src/main/java/subway/view/OutputView.java     | 8 ++++----
 5 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/src/main/java/subway/Application.java b/src/main/java/subway/Application.java
index e0f99c035..bf14ff136 100644
--- a/src/main/java/subway/Application.java
+++ b/src/main/java/subway/Application.java
@@ -9,6 +9,6 @@ public class Application {
     public static void main(String[] args) {
         final Scanner scanner = new Scanner(System.in);
         MainService mainService = new MainService(scanner);
-        mainService.start();
+        mainService.run();
     }
 }
diff --git a/src/main/java/subway/service/CrudService.java b/src/main/java/subway/service/CrudService.java
index 3db5a26e7..b79735c76 100644
--- a/src/main/java/subway/service/CrudService.java
+++ b/src/main/java/subway/service/CrudService.java
@@ -9,12 +9,12 @@ public abstract class CrudService implements MapService {
 
     private InputView inputView;
     private OutputView outputView;
-    private String information;
+    private String functionInformation;
 
-    public CrudService(InputView inputView, OutputView outputView, String information) {
+    public CrudService(InputView inputView, OutputView outputView, String functionInformation) {
         this.inputView = inputView;
         this.outputView = outputView;
-        this.information = information;
+        this.functionInformation = functionInformation;
     }
 
     public InputView getInputView() {
@@ -28,7 +28,7 @@ public OutputView getOutputView() {
     @Override
     public void run() {
         try {
-            String selectedFunction = inputView.getFunctionInput(information);
+            String selectedFunction = inputView.getFunctionInput(functionInformation);
             Function.validate(selectedFunction);
             runSelectedFunction(selectedFunction);
         } catch (InvalidInputException e) {
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index a0d53676c..5975cb2da 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -7,7 +7,7 @@
 
 import java.util.Scanner;
 
-public class MainService {
+public class MainService implements MapService {
 
     private boolean isContinue = true;
 
@@ -37,7 +37,8 @@ private void initViews(Scanner scanner) {
     }
 
 
-    public void start() {
+    @Override
+    public void run() {
         while (isContinue)
             runService();
     }
diff --git a/src/main/java/subway/view/InputView.java b/src/main/java/subway/view/InputView.java
index 767dfa3a0..b4aa4e9b6 100644
--- a/src/main/java/subway/view/InputView.java
+++ b/src/main/java/subway/view/InputView.java
@@ -19,14 +19,14 @@ public InputView(Scanner scanner) {
         this.scanner = scanner;
     }
 
-    public String getFunctionInput(String information) {
-        System.out.println(information);
+    public String getSelectedServiceInput() {
+        System.out.println(MAIN_INFO);
         return scanner.nextLine();
     }
 
 
-    public String getSelectedServiceInput() {
-        System.out.println(MAIN_INFO);
+    public String getFunctionInput(String information) {
+        System.out.println(information);
         return scanner.nextLine();
     }
 
diff --git a/src/main/java/subway/view/OutputView.java b/src/main/java/subway/view/OutputView.java
index 482b21e3a..3345bb2ff 100644
--- a/src/main/java/subway/view/OutputView.java
+++ b/src/main/java/subway/view/OutputView.java
@@ -19,6 +19,10 @@ public void printInformation(String information) {
         print(information);
     }
 
+    private void printEmptyLine() {
+        print("");
+    }
+
     private void print(String message) {
         System.out.println(message);
     }
@@ -29,10 +33,6 @@ public void printStationList() {
             print(INFO_HEADER + station.getName());
     }
 
-    private void printEmptyLine() {
-        print("");
-    }
-
     public void printLineList() {
         print(SHOW_LINE_INFO);
         for (Line line : LineRepository.lines())

From af18a44709d40c222d7aa6823a4fc087495e0ce1 Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Tue, 15 Dec 2020 23:25:35 +0900
Subject: [PATCH 50/51] refactor: seperate inputView and outputView functions

---
 src/main/java/subway/service/CrudService.java |   7 +-
 src/main/java/subway/service/LineService.java |  41 ++++++-
 src/main/java/subway/service/LinkService.java |  42 +++++++-
 src/main/java/subway/service/MainService.java |   9 +-
 .../java/subway/service/StationService.java   |  16 ++-
 src/main/java/subway/view/InputView.java      | 102 ++----------------
 6 files changed, 115 insertions(+), 102 deletions(-)

diff --git a/src/main/java/subway/service/CrudService.java b/src/main/java/subway/service/CrudService.java
index b79735c76..c10a01631 100644
--- a/src/main/java/subway/service/CrudService.java
+++ b/src/main/java/subway/service/CrudService.java
@@ -28,7 +28,7 @@ public OutputView getOutputView() {
     @Override
     public void run() {
         try {
-            String selectedFunction = inputView.getFunctionInput(functionInformation);
+            String selectedFunction = getSelectedFunction();
             Function.validate(selectedFunction);
             runSelectedFunction(selectedFunction);
         } catch (InvalidInputException e) {
@@ -36,6 +36,11 @@ public void run() {
         }
     }
 
+    private String getSelectedFunction() {
+        outputView.printInformation(functionInformation);
+        return inputView.getSelectedFunctionInput();
+    }
+
     private void runSelectedFunction(String selectedFunction) {
         if (selectedFunction.equals(Function.ADD.getCode()))
             add();
diff --git a/src/main/java/subway/service/LineService.java b/src/main/java/subway/service/LineService.java
index 13ffb4067..0cac4bd38 100644
--- a/src/main/java/subway/service/LineService.java
+++ b/src/main/java/subway/service/LineService.java
@@ -3,12 +3,17 @@
 import subway.constant.Constant;
 import subway.constant.InitialData;
 import subway.domain.Line;
+import subway.domain.Station;
 import subway.exception.InvalidInputException;
 import subway.repository.LineRepository;
 import subway.repository.StationRepository;
 import subway.view.InputView;
 import subway.view.OutputView;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 import static subway.constant.Information.*;
 
 public class LineService extends CrudService {
@@ -25,12 +30,39 @@ private void initLines() {
 
     @Override
     public void add() {
-        Line newLine = getInputView().getNewLineInput();
+        Line newLine = getNewLine();
         validateNewLine(newLine);
         LineRepository.addLine(newLine);
         getOutputView().printInformation(ADD_LINE_SUCCESS);
     }
 
+    private Line getNewLine() {
+        String name = getNewLineName();
+        List<Station> endStations = getNewLineEndStations();
+        return new Line(name, endStations);
+    }
+
+    private String getNewLineName() {
+        getOutputView().printInformation(ADD_LINE_INFO);
+        return getInputView().getLineName();
+    }
+
+    private List<Station> getNewLineEndStations() {
+        Station upEnd = getNewLineUpEnd();
+        Station downEnd = getNewLineDownEnd();
+        return new ArrayList<>(Arrays.asList(upEnd, downEnd));
+    }
+
+    private Station getNewLineUpEnd() {
+        getOutputView().printInformation(ADD_LINE_INFO_UP_END);
+        return new Station(getInputView().getStationName());
+    }
+
+    private Station getNewLineDownEnd() {
+        getOutputView().printInformation(ADD_LINE_INFO_DOWN_END);
+        return new Station(getInputView().getStationName());
+    }
+
     private void validateNewLine(Line newLine) {
         validateNameLength(newLine);
         validateDuplicateLineExists(newLine);
@@ -56,12 +88,17 @@ private void validateEndStationsExist(Line newLine) {
 
     @Override
     public void delete() {
-        String targetLineName = getInputView().getTargetLineNameInput();
+        String targetLineName = getTargetLineName();
         validateTargetLine(targetLineName);
         LineRepository.deleteLineByName(targetLineName);
         getOutputView().printInformation(DELETE_LINE_SUCCESS);
     }
 
+    private String getTargetLineName() {
+        getOutputView().printInformation(DELETE_STATION_INFO);
+        return getInputView().getLineName();
+    }
+
     private void validateTargetLine(String targetLineName) {
         Line targetLine = new Line(targetLineName);
         if (!LineRepository.lines().contains(targetLine))
diff --git a/src/main/java/subway/service/LinkService.java b/src/main/java/subway/service/LinkService.java
index 59e73da93..978d8b786 100644
--- a/src/main/java/subway/service/LinkService.java
+++ b/src/main/java/subway/service/LinkService.java
@@ -22,7 +22,7 @@ public LinkService(InputView inputView, OutputView outputView) {
     @Override
     public void add() {
         try {
-            Link newLink = getInputView().getNewLinkInput();
+            Link newLink = getNewLink();
             validateNewLink(newLink);
             addNewLink(newLink);
             getOutputView().printInformation(ADD_LINK_SUCCESS);
@@ -31,6 +31,28 @@ public void add() {
         }
     }
 
+    private Link getNewLink() throws NumberFormatException {
+        String lineName = getLineNameOnAdd();
+        String stationName = getStationNameOnAdd();
+        int order = getOrderOnAdd();
+        return new Link(lineName, stationName, order);
+    }
+
+    private String getLineNameOnAdd() {
+        getOutputView().printInformation(ADD_LINK_INFO_LINE);
+        return getInputView().getLineName();
+    }
+
+    private String getStationNameOnAdd() {
+        getOutputView().printInformation(ADD_LINK_INFO_STATION);
+        return getInputView().getStationName();
+    }
+
+    private int getOrderOnAdd() throws NumberFormatException {
+        getOutputView().printInformation(ADD_LINK_INFO_ORDER);
+        return getInputView().getOrder();
+    }
+
     private void validateNewLink(Link newLink) {
         validateLineExists(newLink.getLineName());
         validateStationExists(newLink.getStationName());
@@ -67,12 +89,28 @@ private void addNewLink(Link newLink) {
 
     @Override
     public void delete() {
-        Link targetLink = getInputView().getTargetLinkInput();
+        Link targetLink = getTargetLink();
         validateTargetLink(targetLink);
         deleteTargetLink(targetLink);
         getOutputView().printInformation(DELETE_LINK_SUCCESS);
     }
 
+    private Link getTargetLink() {
+        String targetLineName = getTargetLineNameOnDelete();
+        String targetStationName = getTargetStationNameOnDelete();
+        return new Link(targetLineName, targetStationName);
+    }
+
+    private String getTargetLineNameOnDelete() {
+        getOutputView().printInformation(DELETE_LINK_INFO_LINE);
+        return getInputView().getLineName();
+    }
+
+    private String getTargetStationNameOnDelete() {
+        getOutputView().printInformation(DELETE_LINK_INFO_STATION);
+        return getInputView().getStationName();
+    }
+
     private void validateTargetLink(Link targetLink) {
         validateLineExists(targetLink.getLineName());
         validateStationExists(targetLink.getStationName());
diff --git a/src/main/java/subway/service/MainService.java b/src/main/java/subway/service/MainService.java
index 5975cb2da..149121d64 100644
--- a/src/main/java/subway/service/MainService.java
+++ b/src/main/java/subway/service/MainService.java
@@ -7,6 +7,8 @@
 
 import java.util.Scanner;
 
+import static subway.constant.Information.MAIN_INFO;
+
 public class MainService implements MapService {
 
     private boolean isContinue = true;
@@ -45,7 +47,7 @@ public void run() {
 
     private void runService() {
         try {
-            String selectedService = inputView.getSelectedServiceInput();
+            String selectedService = getSelectedService();
             Service.validate(selectedService);
             runSelectedService(selectedService);
         } catch (InvalidInputException e) {
@@ -53,6 +55,11 @@ private void runService() {
         }
     }
 
+    private String getSelectedService() {
+        outputView.printInformation(MAIN_INFO);
+        return inputView.getSelectedServiceInput();
+    }
+
     private void runSelectedService(String selectedService) {
         if (selectedService.equals(Service.STATION.getCode()))
             stationService.run();
diff --git a/src/main/java/subway/service/StationService.java b/src/main/java/subway/service/StationService.java
index b82a59524..01380b5c3 100644
--- a/src/main/java/subway/service/StationService.java
+++ b/src/main/java/subway/service/StationService.java
@@ -11,8 +11,7 @@
 import subway.view.InputView;
 import subway.view.OutputView;
 
-import static subway.constant.Information.ADD_STATION_SUCCESS;
-import static subway.constant.Information.DELETE_STATION_SUCCESS;
+import static subway.constant.Information.*;
 
 public class StationService extends CrudService {
 
@@ -28,12 +27,16 @@ private void initStations() {
 
     @Override
     public void add() {
-        Station newStation = getInputView().getNewStationInput();
+        Station newStation = getNewStation();
         validateNewStation(newStation);
         StationRepository.addStation(newStation);
         getOutputView().printInformation(ADD_STATION_SUCCESS);
     }
 
+    private Station getNewStation() {
+        getOutputView().printInformation(ADD_STATION_INFO);
+        return new Station(getInputView().getStationName());
+    }
 
     private void validateNewStation(Station newStation) {
         validateNameLength(newStation);
@@ -53,12 +56,17 @@ private void validateDuplicateStationExists(Station newStation) {
 
     @Override
     public void delete() {
-        Station targetStation = getInputView().getTargetStationInput();
+        Station targetStation = getTargetStation();
         validateTargetStation(targetStation);
         StationRepository.deleteStationByName(targetStation.getName());
         getOutputView().printInformation(DELETE_STATION_SUCCESS);
     }
 
+    private Station getTargetStation() {
+        getOutputView().printInformation(DELETE_STATION_INFO);
+        return new Station(getInputView().getStationName());
+    }
+
     private void validateTargetStation(Station targetStation) {
         validateTargetStationExists(targetStation);
         validateTargetStationIsNotLinked(targetStation);
diff --git a/src/main/java/subway/view/InputView.java b/src/main/java/subway/view/InputView.java
index b4aa4e9b6..847d7a2ec 100644
--- a/src/main/java/subway/view/InputView.java
+++ b/src/main/java/subway/view/InputView.java
@@ -1,16 +1,7 @@
 package subway.view;
 
-import subway.domain.Line;
-import subway.domain.Link;
-import subway.domain.Station;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
 import java.util.Scanner;
 
-import static subway.constant.Information.*;
-
 public class InputView {
 
     private final Scanner scanner;
@@ -19,101 +10,28 @@ public InputView(Scanner scanner) {
         this.scanner = scanner;
     }
 
-    public String getSelectedServiceInput() {
-        System.out.println(MAIN_INFO);
-        return scanner.nextLine();
-    }
-
-
-    public String getFunctionInput(String information) {
-        System.out.println(information);
-        return scanner.nextLine();
-    }
-
 
-    public Station getNewStationInput() {
-        System.out.println(ADD_STATION_INFO);
-        return new Station(scanner.nextLine());
-    }
-
-
-    public Station getTargetStationInput() {
-        System.out.println(DELETE_STATION_INFO);
-        return new Station(scanner.nextLine());
-    }
-
-
-    public Line getNewLineInput() {
-        String name = getNewLineName();
-        List<Station> endStations = getNewLineEndStations();
-        return new Line(name, endStations);
-    }
-
-    private String getNewLineName() {
-        System.out.println(ADD_LINE_INFO);
+    private String userInputString() {
         return scanner.nextLine();
     }
 
-    private List<Station> getNewLineEndStations() {
-        Station upEnd = getNewLineUpEnd();
-        Station downEnd = getNewLineDownEnd();
-        return new ArrayList<>(Arrays.asList(upEnd, downEnd));
-    }
-
-    private Station getNewLineUpEnd() {
-        System.out.println(ADD_LINE_INFO_UP_END);
-        return new Station(scanner.nextLine());
-    }
-
-    private Station getNewLineDownEnd() {
-        System.out.println(ADD_LINE_INFO_DOWN_END);
-        return new Station(scanner.nextLine());
-    }
-
-
-    public String getTargetLineNameInput() {
-        System.out.println(DELETE_LINE_INFO);
-        return scanner.nextLine();
+    public String getSelectedServiceInput() {
+        return userInputString();
     }
 
-
-    public Link getNewLinkInput() throws NumberFormatException {
-        String lineName = getLineNameOnAdd();
-        String stationName = getStationNameOnAdd();
-        int order = getOrderOnAdd();
-        return new Link(lineName, stationName, order);
+    public String getSelectedFunctionInput() {
+        return userInputString();
     }
 
-    private String getLineNameOnAdd() {
-        System.out.println(ADD_LINK_INFO_LINE);
-        return scanner.nextLine();
+    public String getLineName() {
+        return userInputString();
     }
 
-    private String getStationNameOnAdd() {
-        System.out.println(ADD_LINK_INFO_STATION);
-        return scanner.nextLine();
+    public String getStationName() {
+        return userInputString();
     }
 
-    private int getOrderOnAdd() throws NumberFormatException {
-        System.out.println(ADD_LINK_INFO_ORDER);
+    public int getOrder() throws NumberFormatException {
         return Integer.parseInt(scanner.nextLine()) - 1;
     }
-
-
-    public Link getTargetLinkInput() {
-        String targetLineName = getTargetLineNameOnDelete();
-        String targetStationName = getTargetStationNameOnDelete();
-        return new Link(targetLineName, targetStationName);
-    }
-
-    private String getTargetLineNameOnDelete() {
-        System.out.println(DELETE_LINK_INFO_LINE);
-        return scanner.nextLine();
-    }
-
-    private String getTargetStationNameOnDelete() {
-        System.out.println(DELETE_LINK_INFO_STATION);
-        return scanner.nextLine();
-    }
-
 }

From 9ff0fa5398c7c45f9571136140e7c56c109fd43a Mon Sep 17 00:00:00 2001
From: jiwoo-kimm <jiwoo.kim.dev@gmail.com>
Date: Tue, 15 Dec 2020 23:26:37 +0900
Subject: [PATCH 51/51] docs(readme): update the list to implement

---
 README.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 0378dce63..62bce37c6 100644
--- a/README.md
+++ b/README.md
@@ -528,7 +528,7 @@ This project is [MIT](https://github.com/woowacourse/java-subway-map-precourse/b
     - [x] 구간 삭제 시 상하행 종점역을 갱신한다.
 - [x] 지하철 노선도
     - [x] 모든 노선과 역을 순서대로 출력한다.
-- [ ] 리팩토링
+- [x] 리팩토링
     - [x] 비즈니스 로직과 UI 로직을 분리한다.
-    - [ ] InputView를 통해 사용자 입력을 받는다.
-    - [ ] OutputView를 통해 안내 문구와 결과를 출력한다.
\ No newline at end of file
+    - [x] InputView를 통해 사용자 입력을 받는다.
+    - [x] OutputView를 통해 안내 문구와 결과를 출력한다.
\ No newline at end of file