diff --git a/lab3/.vscode/settings.json b/lab3/.vscode/settings.json
new file mode 100644
index 0000000..e112a70
--- /dev/null
+++ b/lab3/.vscode/settings.json
@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}
diff --git a/lab3/README.md b/lab3/README.md
new file mode 100644
index 0000000..7c03a53
--- /dev/null
+++ b/lab3/README.md
@@ -0,0 +1,18 @@
+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).
diff --git a/lab3/bin/BigDecimal_Operations/Main.class b/lab3/bin/BigDecimal_Operations/Main.class
new file mode 100644
index 0000000..fd283f1
Binary files /dev/null and b/lab3/bin/BigDecimal_Operations/Main.class differ
diff --git a/lab3/bin/Car_Inventory_System/Car.class b/lab3/bin/Car_Inventory_System/Car.class
new file mode 100644
index 0000000..829db8a
Binary files /dev/null and b/lab3/bin/Car_Inventory_System/Car.class differ
diff --git a/lab3/bin/Car_Inventory_System/Sedan.class b/lab3/bin/Car_Inventory_System/Sedan.class
new file mode 100644
index 0000000..cf5a723
Binary files /dev/null and b/lab3/bin/Car_Inventory_System/Sedan.class differ
diff --git a/lab3/bin/Car_Inventory_System/Truck.class b/lab3/bin/Car_Inventory_System/Truck.class
new file mode 100644
index 0000000..252abf8
Binary files /dev/null and b/lab3/bin/Car_Inventory_System/Truck.class differ
diff --git a/lab3/bin/Car_Inventory_System/UtilityVehicle.class b/lab3/bin/Car_Inventory_System/UtilityVehicle.class
new file mode 100644
index 0000000..c776e16
Binary files /dev/null and b/lab3/bin/Car_Inventory_System/UtilityVehicle.class differ
diff --git a/lab3/bin/IntList_Interface/IntArrayList.class b/lab3/bin/IntList_Interface/IntArrayList.class
new file mode 100644
index 0000000..0a2396a
Binary files /dev/null and b/lab3/bin/IntList_Interface/IntArrayList.class differ
diff --git a/lab3/bin/IntList_Interface/IntList.class b/lab3/bin/IntList_Interface/IntList.class
new file mode 100644
index 0000000..abcba00
Binary files /dev/null and b/lab3/bin/IntList_Interface/IntList.class differ
diff --git a/lab3/bin/IntList_Interface/IntVector.class b/lab3/bin/IntList_Interface/IntVector.class
new file mode 100644
index 0000000..c720dea
Binary files /dev/null and b/lab3/bin/IntList_Interface/IntVector.class differ
diff --git a/lab3/bin/IntList_Interface/README.md b/lab3/bin/IntList_Interface/README.md
new file mode 100644
index 0000000..ca6721b
--- /dev/null
+++ b/lab3/bin/IntList_Interface/README.md
@@ -0,0 +1,12 @@
+IntArrayList:
+
+-- using this class is good when you are adding not many elements to the list. because it creates less free slots that will not take much memory
+
+IntVector:
+
+-- this class is good when you need to add more items. it makes less copies and give more slots.
+
+
+note:
+-- if use IntArrayList when you need more slots, then copying of the prev. arrays will fill memory.
+
diff --git a/lab3/bin/Video_Streaming_Service/Movie.class b/lab3/bin/Video_Streaming_Service/Movie.class
new file mode 100644
index 0000000..0ca8669
Binary files /dev/null and b/lab3/bin/Video_Streaming_Service/Movie.class differ
diff --git a/lab3/bin/Video_Streaming_Service/TvSeries.class b/lab3/bin/Video_Streaming_Service/TvSeries.class
new file mode 100644
index 0000000..1aba67b
Binary files /dev/null and b/lab3/bin/Video_Streaming_Service/TvSeries.class differ
diff --git a/lab3/bin/Video_Streaming_Service/Video.class b/lab3/bin/Video_Streaming_Service/Video.class
new file mode 100644
index 0000000..7782c24
Binary files /dev/null and b/lab3/bin/Video_Streaming_Service/Video.class differ
diff --git a/lab3/src/BigDecimal_Operations/Main.java b/lab3/src/BigDecimal_Operations/Main.java
new file mode 100644
index 0000000..b7a8dcd
--- /dev/null
+++ b/lab3/src/BigDecimal_Operations/Main.java
@@ -0,0 +1,26 @@
+package BigDecimal_Operations;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+
+
+
+    }
+
+//BigDecimal Operations
+//1
+    public double task1Method(BigDecimal bigD){
+
+        return bigD.setScale(2, RoundingMode.HALF_UP).doubleValue();
+
+    }
+
+    //2  signum() checks if biginteger positive negative or 0
+    public BigDecimal task2Method(BigDecimal bigD){
+        BigDecimal result = bigD.setScale(1, RoundingMode.HALF_UP);
+
+        return result.negate();
+    }
+}
diff --git a/lab3/src/Car_Inventory_System/Car.java b/lab3/src/Car_Inventory_System/Car.java
new file mode 100644
index 0000000..714a26a
--- /dev/null
+++ b/lab3/src/Car_Inventory_System/Car.java
@@ -0,0 +1,50 @@
+package Car_Inventory_System;
+
+public abstract class Car {
+
+    private String vinNumber;
+    private String make;
+    private String model;
+    private int mileage;
+
+    public String getInfo(){
+
+        return "vinNumber is " + this.vinNumber + "\nmake is "+ make 
+                +"\nmodel is " + model+ "\nmileage is "+ mileage;
+    }
+
+
+    public String getVinNumber() {
+        return vinNumber;
+    }
+
+    public void setVinNumber(String vinNumber) {
+        this.vinNumber = vinNumber;
+    }
+
+    public String getMake() {
+        return make;
+    }
+
+    public void setMake(String make) {
+        this.make = make;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public void setModel(String model) {
+        this.model = model;
+    }
+
+    public int getMileage() {
+        return mileage;
+    }
+
+    public void setMileage(int mileage) {
+        this.mileage = mileage;
+    }
+
+    
+}
diff --git a/lab3/src/Car_Inventory_System/Sedan.java b/lab3/src/Car_Inventory_System/Sedan.java
new file mode 100644
index 0000000..d899dce
--- /dev/null
+++ b/lab3/src/Car_Inventory_System/Sedan.java
@@ -0,0 +1,5 @@
+package Car_Inventory_System;
+
+public class Sedan extends Car{
+
+}
diff --git a/lab3/src/Car_Inventory_System/Truck.java b/lab3/src/Car_Inventory_System/Truck.java
new file mode 100644
index 0000000..3d28d66
--- /dev/null
+++ b/lab3/src/Car_Inventory_System/Truck.java
@@ -0,0 +1,16 @@
+package Car_Inventory_System;
+
+public class Truck extends Car{
+
+    private double towingCapacity;
+
+    public double getTowingCapacity() {
+        return towingCapacity;
+    }
+
+    public void setTowingCapacity(double towingCapacity) {
+        this.towingCapacity = towingCapacity;
+    }
+    
+
+}
diff --git a/lab3/src/Car_Inventory_System/UtilityVehicle.java b/lab3/src/Car_Inventory_System/UtilityVehicle.java
new file mode 100644
index 0000000..22384f5
--- /dev/null
+++ b/lab3/src/Car_Inventory_System/UtilityVehicle.java
@@ -0,0 +1,15 @@
+package Car_Inventory_System;
+
+public class UtilityVehicle extends Car{
+
+    private boolean fourWheelDrive;
+
+    public boolean isFourWheelDrive() {
+        return fourWheelDrive;
+    }
+
+    public void setFourWheelDrive(boolean fourWheelDrive) {
+        this.fourWheelDrive = fourWheelDrive;
+    }
+
+}
diff --git a/lab3/src/IntList_Interface/IntArrayList.java b/lab3/src/IntList_Interface/IntArrayList.java
new file mode 100644
index 0000000..b2588dc
--- /dev/null
+++ b/lab3/src/IntList_Interface/IntArrayList.java
@@ -0,0 +1,43 @@
+package IntList_Interface;
+//readme.md is in package itself
+
+public class IntArrayList implements IntList {
+
+    private int currentIndex = 0;
+
+    private int[] array = new int[10];
+    
+
+    @Override
+    public void add(int eded) {
+
+        //
+        if (currentIndex == array.length) {
+
+            int[] newarr = new int[(int) (array.length * 1.5)];
+
+            for (int i = 0; i < array.length; i++) {
+                newarr[i] = array[i];
+
+            }
+
+            array = newarr;
+        }
+
+        array[currentIndex] = eded;
+        currentIndex++;
+
+    }
+
+    @Override
+    public int get(int id) {
+
+        if (id >= 0 && id < array.length) {
+            return array[id];
+        } 
+        else {
+            return -1;
+        }
+    }
+
+}
diff --git a/lab3/src/IntList_Interface/IntList.java b/lab3/src/IntList_Interface/IntList.java
new file mode 100644
index 0000000..0d3e964
--- /dev/null
+++ b/lab3/src/IntList_Interface/IntList.java
@@ -0,0 +1,12 @@
+package IntList_Interface;
+
+public interface IntList {
+
+
+    void add(int number);
+
+    int get(int id);
+    
+
+
+}
diff --git a/lab3/src/IntList_Interface/IntVector.java b/lab3/src/IntList_Interface/IntVector.java
new file mode 100644
index 0000000..d5676c1
--- /dev/null
+++ b/lab3/src/IntList_Interface/IntVector.java
@@ -0,0 +1,43 @@
+package IntList_Interface;
+
+public class IntVector implements IntList {
+
+private int currentIndex = 0;
+
+    private int[] array = new int[10];
+    
+
+    @Override
+    public void add(int eded) {
+
+        
+        if (currentIndex == array.length) {
+
+            int[] newarr = new int[array.length * 2];
+
+            for (int i = 0; i < array.length; i++) {
+                newarr[i] = array[i];
+
+            }
+
+            array = newarr;
+        }
+
+        array[currentIndex] = eded;
+        currentIndex++;
+
+    }
+
+    @Override
+    public int get(int id) {
+
+        if (id >= 0 && id < array.length) {
+            return array[id];
+        } 
+        else {
+            return -1;
+            //
+        }
+    }
+
+}
diff --git a/lab3/src/IntList_Interface/README.md b/lab3/src/IntList_Interface/README.md
new file mode 100644
index 0000000..ca6721b
--- /dev/null
+++ b/lab3/src/IntList_Interface/README.md
@@ -0,0 +1,12 @@
+IntArrayList:
+
+-- using this class is good when you are adding not many elements to the list. because it creates less free slots that will not take much memory
+
+IntVector:
+
+-- this class is good when you need to add more items. it makes less copies and give more slots.
+
+
+note:
+-- if use IntArrayList when you need more slots, then copying of the prev. arrays will fill memory.
+
diff --git a/lab3/src/Video_Streaming_Service/Movie.java b/lab3/src/Video_Streaming_Service/Movie.java
new file mode 100644
index 0000000..20645d1
--- /dev/null
+++ b/lab3/src/Video_Streaming_Service/Movie.java
@@ -0,0 +1,15 @@
+package Video_Streaming_Service;
+
+public class Movie  extends Video{
+
+    private double rating;
+
+    public double getRating() {
+        return rating;
+    }
+
+    public void setRating(double rating) {
+        this.rating = rating;
+    }
+
+}
diff --git a/lab3/src/Video_Streaming_Service/TvSeries.java b/lab3/src/Video_Streaming_Service/TvSeries.java
new file mode 100644
index 0000000..c50daf8
--- /dev/null
+++ b/lab3/src/Video_Streaming_Service/TvSeries.java
@@ -0,0 +1,15 @@
+package Video_Streaming_Service;
+
+public class TvSeries extends Video{
+
+    private int episodes;
+
+    public int getEpisodes() {
+        return episodes;
+    }
+
+    public void setEpisodes(int episodes) {
+        this.episodes = episodes;
+    }
+
+}
diff --git a/lab3/src/Video_Streaming_Service/Video.java b/lab3/src/Video_Streaming_Service/Video.java
new file mode 100644
index 0000000..bf6210b
--- /dev/null
+++ b/lab3/src/Video_Streaming_Service/Video.java
@@ -0,0 +1,13 @@
+package Video_Streaming_Service;
+
+public abstract class Video {
+
+    private String title;
+    private int duration;
+
+    public String getInfo(){
+
+        return "title is " + this.title + "\nduration"+ duration; 
+
+    }
+}