Completed LAB1 challenges

source/Challenge1.java

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+import java.util.Arrays;
+import java.util.Scanner;
+
+public class Challenge1 {
+    // 1) Difference between largest and smallest values in an int array (length >= 1)
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter the number of elements: ");
+        int n = sc.nextInt();
+        int[] arr = new int[n];
+        System.out.println("Enter " + n + " integers in different lines:");
+        for (int i = 0; i < n; i++) {
+            arr[i] = sc.nextInt();
+        }
+
+        // Call the getdifference method
+        int diff = getdifference(arr);
+        System.out.println("Difference between max and min: " + diff);
+        sc.close();
+    }
+    public static int getdifference(int[] arr) {
+            if (arr == null || arr.length == 0) {
+                System.out.println("invalid array");
+            }
+            int min = Integer.MAX_VALUE;
+            int max = Integer.MIN_VALUE;
+
+            // Loop + conditionals
+            for (int i = 0; i < arr.length; i++) {
+                if (arr[i] < min) min = arr[i];
+                if (arr[i] > max) max = arr[i];
+            }
+            return max - min;
+
+        }
+    }
+

source/Challenge4.java

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+public class Challenge4 {
+}

source/Employee.java

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+public class Employee {
+    private int id;
+    private String name;
+    private String role;
+    private double salary;
+
+    // --- Constructor ---
+    public Employee(int id, String name, String role, double salary) {
+        this.id = id;
+        this.name = name;
+        this.role = role;
+        this.salary = salary;
+    }
+
+    // --- Getters (to read values) ---
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getRole() {
+        return role;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    // --- Setters (to update values) ---
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setRole(String role) {
+        this.role = role;
+    }
+
+    public void setSalary(double salary) {
+        if (salary >= 0) {          // basic validation
+            this.salary = salary;
+        } else {
+            System.out.println("Salary cannot be negative!");
+        }
+    }
+
+
+    public void displayInfo() {
+        System.out.println("Employee ID: " + id);
+        System.out.println("Name: " + name);
+        System.out.println("Role: " + role);
+        System.out.println("Salary: " + salary);
+    }
+}

source/Intern.java

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+public class Intern extends Employee{
+    public static final double MAX_SALARY = 20000.0;
+
+    // Constructor
+    public Intern(int id, String name, String role, double salary) {
+        // Set a temporary salary (0), then use our overridden setter
+        // so the validation (cap) is applied.
+        super(id, name, role, 0);
+        setSalary(salary);  // will validate against MAX_SALARY
+    }
+
+    // Override setSalary to enforce the cap
+    @Override
+    public void setSalary(double salary) {
+        if (salary < 0) {
+            System.out.println("Salary cannot be negative!");
+            return;
+        }
+        if (salary > MAX_SALARY) {
+            System.out.println("Intern salary cannot exceed " + MAX_SALARY+".");
+            super.setSalary(MAX_SALARY);
+        } else {
+            super.setSalary(salary);
+        }
+    }
+
+    // (Optional) A helper to show it's an intern when printing
+    @Override
+    public void displayInfo() {
+        System.out.println("=== Intern ===");
+        super.displayInfo();
+        System.out.println("Intern Max Salary: " + MAX_SALARY);
+    }
+}
+

source/challenge2.java

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+public class challenge2 {
+    public static void findSmallest(int[] arr) {
+        if (arr == null || arr.length < 2) {
+            System.out.println("Need at least 2 elements");
+            return;
+        }
+
+        // Start by assuming first two numbers are smallest and second smallest
+        int smallest = arr[0];
+        int secondSmallest = arr[1];
+
+        // Make sure smallest < secondSmallest
+        if (smallest > secondSmallest) {
+            int temp = smallest;
+            smallest = secondSmallest;
+            secondSmallest = temp;
+        }
+
+        // Check rest of the array
+        for (int i = 2; i < arr.length; i++) {
+            int current = arr[i];
+
+            if (current < smallest) {
+                // Found new smallest, shift previous smallest to secondSmallest
+                secondSmallest = smallest;
+                smallest = current;
+            } else if (current < secondSmallest && current != smallest) {
+                // Found new second smallest (different from smallest)
+                secondSmallest = current;
+            }
+        }
+
+        // Print results
+        System.out.println("Smallest: " + smallest);
+        System.out.println("Second smallest: " + secondSmallest);
+    }
+
+    public static void main(String[] args) {
+        int[] data = {7, 2, 9, 2, 15, 8, 3};
+        findSmallest(data);
+    }
+}
+
+
+

source/main.java

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+public class main {
+    public static void main(String[] args) {
+        // Create Employee objects
+        Employee e1 = new Employee(1, "Swikriti", "Associate", 55000);
+        Employee e2 = new Employee(2, "Harsha", "Professor", 48000);
+
+        // Display information
+        e1.displayInfo();
+        System.out.println("----");
+        e2.displayInfo();
+
+        // Update salary
+        e1.setSalary(60000);
+        System.out.println("Updated Salary for " + e1.getName() + ": " + e1.getSalary());
+    }
+
+}

source/main1.java

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+public class main1 {
+    public static void main(String[] args) {
+        Intern i1 = new Intern(101, "Riya", "Intern - QA", 18000);
+        i1.displayInfo();
+
+        System.out.println("---- Trying to set salary above the cap ----");
+        i1.setSalary(25000);  // will be capped to 20000
+        i1.displayInfo();
+    }
+}
+

source/main3.java

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+public class main3 {
+    public static void main(String[] args) {
+        // Create an array to hold 10 employees
+        Employee[] employees = new Employee[10];
+
+        // Fill with sample employees
+        employees[0] = new Employee(1, "Harsha", "Professor", 55000);
+        employees[1] = new Employee(2, "Swikriti", "Associate", 48000);
+        employees[2] = new Employee(3, "Abhishek", "Manager", 72000);
+        employees[3] = new Employee(4, "Diana", "Tester", 40000);
+        employees[4] = new Employee(5, "Sudha", "Teacher", 35000);
+        employees[5] = new Employee(6, "Saras", "HR", 45000);
+        employees[6] = new Employee(7, "Suyash", "Chemist", 50000);
+        employees[7] = new Employee(8, "Hannah", "Intern", 20000);
+        employees[8] = new Employee(9, "Isha", "Tech Lead", 80000);
+        employees[9] = new Employee(10, "Julia", "Product Owner", 90000);
+
+        // Print all employees
+        System.out.println("=== Employee List ===");
+        for (Employee e : employees) {
+            e.displayInfo();
+            System.out.println("--------------");
+        }
+    }
+}