2078

`import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ExamQuestion extends JFrame implements MouseListener {
    private JTextField num1Field, num2Field;
    private JLabel resultLabel;
    private int num1, num2;

    public ExamQuestion() {
        // Set up the JFrame
        super("Sum and Difference Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(4, 2));

        // Create the input text fields
        num1Field = new JTextField();
        num2Field = new JTextField();
        add(new JLabel("Enter first number: "));
        add(num1Field);
        add(new JLabel("Enter second number: "));
        add(num2Field);

        // Create the Calculate button
        JButton calculateButton = new JButton("Calculate");
        add(calculateButton);

        // Create the output label
        resultLabel = new JLabel();
        add(resultLabel);

        // Add mouse listener to the label
        calculateButton.addMouseListener(this);

        // Show the JFrame
        pack();
        setVisible(true);
    }




    // Mouse listener methods
    public void mousePressed(MouseEvent e) {
        // Calculate the sum and display it when the button is clicked
        try {
            num1 = Integer.parseInt(num1Field.getText());
            num2 = Integer.parseInt(num2Field.getText());
            resultLabel.setText("Sum: " + (num1 + num2));
        } catch (NumberFormatException ex) {
            resultLabel.setText("Invalid input!");
        }
    }

    public void mouseReleased(MouseEvent e) {
        // Calculate the difference and display it when the mouse is released over the label
        try {
            num1 = Integer.parseInt(num1Field.getText());
            num2 = Integer.parseInt(num2Field.getText());
            resultLabel.setText("Difference: " + (num1 - num2));
        } catch (NumberFormatException ex) {
            resultLabel.setText("Invalid input!");
        }
    }

    // Unused mouse listener methods
    public void mouseClicked(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}

    public static void main(String[] args) {
        new ExamQuestion();
    }
}`