Lab finished

.gitignore

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+/out
+/.idea

Employee.java

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+import java.util.Scanner;
+
+public class Employee {
+
+    // Define employee properties
+    private String name;
+    private int age;
+    boolean isActive;
+    private double salary;
+
+    // Set properties of employee
+    public Employee(String name, int age, boolean isActive, double salary) {
+        setName(name);
+        setAge(age);
+        setActive(isActive);
+        setSalary(salary);
+    }
+
+    // Getters and Setters
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public boolean isActive() {
+        return isActive;
+    }
+
+    public void setActive(boolean active) {
+        isActive = active;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+}
+
+class Intern extends Employee {
+    // Set properties of Intern
+    // Using super to get properties from Employee class
+    public Intern(String name, int age, boolean isActive, double salary) {
+        super(name, age, isActive, salary);
+    }
+
+
+    // Custom setSalary to check if intern
+    // has higher salary than 20000
+    public void setSalary(double salary) {
+        double maxInternSalary = 20000;
+
+        // If salary is higher than maxInternSalary
+        if(salary > maxInternSalary){
+            // Print warning that salary exceeds limit
+            // Set salary to maxInternSalary
+            System.out.println("!!! [INTERN] " + getName() + "'s salary exceeds maximum salary of €" + maxInternSalary + " (€" + salary + ")");
+            System.out.println("!!! Type \"continue\" to set " + getName() + "'s salary to €" + maxInternSalary + " or \"edit\" to change " + getName() + "'s salary");
+            Scanner sc = new Scanner(System.in);
+            String validate = sc.nextLine();
+
+            // Continue by automatically setting the salary to the maxInternSalary
+            if(validate.equals("continue")){
+                System.out.println("!!! Setting " + getName() + "'s salary to €" + maxInternSalary);
+                super.setSalary(20000);
+            }
+            // Edit the salary manually
+            else if(validate.equals("edit")){
+                System.out.println("Enter the new salary for " + getName());
+                double newSalary = sc.nextDouble();
+                super.setSalary(newSalary);
+            }
+        }
+        // Set salary as passed
+        else {
+            super.setSalary(salary);
+        }
+    }
+}

Main.java

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+import java.util.ArrayList;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("========= TASK 1 & 2 =========");
+        // Call maxMinDiff method
+        maxMinDiff();
+
+        System.out.println("\n========= TASK 3 & 4 =========");
+        // Create array of Employee objects using ArrayList
+        ArrayList<Employee> employees = new ArrayList<>();
+        employees.add(new Employee("Alex", 21, true, 23845));
+        employees.add(new Employee("Ben", 25, true, 21943));
+        employees.add(new Employee("Charlie", 23, false, 0));
+        employees.add(new Intern("David", 28, true, 18500));
+        employees.add(new Employee("Elizabeth", 22, true, 19945));
+        employees.add(new Employee("Frank", 26, true, 22345));
+        employees.add(new Employee("George", 27, true, 23845));
+        employees.add(new Intern("Hannah", 22, true, 18500));
+        employees.add(new Intern("Isabella", 23, true, 18500));
+        employees.add(new Intern("Jack", 24, true, 21900));
+
+        // For loop to print employee information
+        for (Employee employee : employees) {
+            // if employee is an intern
+            if (employee instanceof Intern) {
+                // Print intern information
+                System.out.println("\nIntern:" + "\nName: " + employee.getName() + "\nAge: " + employee.getAge() + "\nIs active: " + employee.isActive() + "\nSalary: €" + employee.getSalary());
+            }
+            // if employee is not an intern
+            else {
+                // Print employee information
+                System.out.println("\nEmployee:" + "\nName: " + employee.getName() + "\nAge: " + employee.getAge() + "\nIs active: " + employee.isActive() + "\nSalary: " + employee.getSalary());
+            }
+        }
+    }
+
+    // Method to print maximum, minimum and difference between highest and lowest numbers in an array
+    public static void maxMinDiff() {
+        // Creating array using ArrayList
+        ArrayList<Integer> numbers = new ArrayList<>();
+        numbers.add(1);
+        numbers.add(3);
+        numbers.add(2);
+        numbers.add(7);
+        numbers.add(9);
+        numbers.add(23);
+        numbers.add(12);
+        numbers.add(18);
+
+        // Print the numbers array as string
+        System.out.println("Numbers: " + numbers);
+
+        // Define variables
+        int highestNumber = 0;
+        int lowestNumber = Integer.MAX_VALUE;
+        int secondLowestNumber = Integer.MAX_VALUE;
+
+        // For loop going through all numbers in array
+        for (int number : numbers) {
+            // if current number is higher than highestNumber
+            // set highestNumber to current number
+            if(number > highestNumber){
+                highestNumber = number;
+            }
+
+            // if current number is lower than lowestNumber
+            // set lowestNumber to current number
+            if(number < lowestNumber){
+                lowestNumber = number;
+            }
+        }
+
+        // For loop again to get the second-lowest number
+        for (int number : numbers) {
+            // if current number is lower than secondLowestNumber and
+            // higher than lowestNumber, set secondLowestNumber to current number
+            if(number < secondLowestNumber && number > lowestNumber){
+                secondLowestNumber = number;
+            }
+        }
+
+        // Print results
+        System.out.println("Highest number: " + highestNumber);
+        System.out.println("Lowest number: " + lowestNumber);
+        System.out.println("Difference between highest and lowest numbers: " + (highestNumber-lowestNumber));
+        System.out.println("Second-lowest number: " + secondLowestNumber);
+
+    }
+}