LAB Java Basics - alexcaoglez

src/Employee.java

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+public class Employee {
+    // Properties
+    private String name;
+    private int id;
+    private double salary;
+
+    // Constructor
+    public Employee(String name, int id, double salary) {
+        this.name = name;
+        this.id = id;
+        this.salary = salary;
+    }
+
+    // Getters and Setters
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    // toString method to print properties
+    @Override
+    public String toString() {
+        return "Employee{" +
+                "name='" + name + '\'' +
+                ", id=" + id +
+                ", salary=" + salary +
+                '}';
+    }
+}

src/Intern.java

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+public class Intern extends Employee {
+    // Salary limit constant
+    private static final double MAX_SALARY = 20000.0;
+
+    public Intern(String name, int id, double salary) {
+        super(name, id, salary);
+        // Validate salary on creation
+        if (salary > MAX_SALARY) {
+            throw new IllegalArgumentException("Intern salary cannot exceed " + MAX_SALARY);
+        }
+    }
+
+    // Override setter to validate on update
+    @Override
+    public void setSalary(double salary) {
+        if (salary > MAX_SALARY) {
+            throw new IllegalArgumentException("Intern salary cannot exceed " + MAX_SALARY);
+        } else {
+            super.setSalary(salary);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "Intern{" +
+                "name='" + getName() + '\'' +
+                ", id=" + getId() +
+                ", salary=" + getSalary() +
+                '}';
+    }
+}

src/Main.java

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+public class Main {
+
+    public static void main(String[] args) {
+        // --- TASK 1: Difference between max and min ---
+        System.out.println("--- Task 1: Difference Between Max and Min ---");
+        int[] numbers1 = {5, 10, 2, 8, 15, 1};
+        int diff = getDifference(numbers1);
+        System.out.println("Difference between largest and smallest: " + diff);
+
+        // --- TASK 2: Smallest and second smallest ---
+        System.out.println("\n--- Task 2: Smallest and Second Smallest ---");
+        int[] numbers2 = {12, 3, 5, 1, 9, 2};
+        findAndPrintSmallest(numbers2);
+
+        // --- TASK 5: Create 10 Employees and print ---
+        System.out.println("\n--- Task 5: List of 10 Employees ---");
+        createAndPrintEmployees();
+    }
+
+    // TASK 1: Method to get the difference
+    public static int getDifference(int[] arr) {
+        if (arr == null || arr.length < 1) {
+            throw new IllegalArgumentException("Array must have at least 1 element");
+        }
+
+        int max = arr[0];
+        int min = arr[0];
+
+        // Using loops and conditionals
+        for (int i = 1; i < arr.length; i++) {
+            if (arr[i] > max) {
+                max = arr[i];
+            }
+            if (arr[i] < min) {
+                min = arr[i];
+            }
+        }
+
+        return max - min;
+    }
+
+    // TASK 2: Method to find and print the two smallest elements
+    public static void findAndPrintSmallest(int[] arr) {
+        if (arr == null || arr.length < 2) {
+            System.out.println("Array needs at least 2 elements for this task.");
+            return;
+        }
+
+        int first = Integer.MAX_VALUE;
+        int second = Integer.MAX_VALUE;
+
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] < first) {
+                second = first;
+                first = arr[i];
+            } else if (arr[i] < second && arr[i] != first) {
+                second = arr[i];
+            }
+        }
+
+        if (second == Integer.MAX_VALUE) {
+            System.out.println("Smallest: " + first + ", Second smallest: Does not exist (equal values)");
+        } else {
+            System.out.println("Smallest: " + first + ", Second smallest: " + second);
+        }
+    }
+
+    // TASK 5: Create 10 employees and print
+    public static void createAndPrintEmployees() {
+        Employee[] employees = new Employee[10];
+
+        employees[0] = new Employee("Juan Perez", 101, 30000);
+        employees[1] = new Intern("Ana Gomez", 102, 15000);
+        employees[2] = new Employee("Carlos Ruiz", 103, 45000);
+        employees[3] = new Intern("Luis Torres", 104, 18000);
+        employees[4] = new Employee("Maria Diaz", 105, 32000);
+        employees[5] = new Intern("Pedro Sanchez", 106, 20000);
+        employees[6] = new Employee("Sofia Lima", 107, 50000);
+        employees[7] = new Intern("Jorge Castro", 108, 12000);
+        employees[8] = new Employee("Elena Nito", 109, 28000);
+        employees[9] = new Employee("Raul Bo", 110, 35000);
+
+        for (int i = 0; i < employees.length; i++) {
+            System.out.println("Employee " + (i + 1) + ": " + employees[i].toString());
+        }
+    }
+}