Handling Key Board Events

Java program that demonstrates the use of KeyAdapter and handles key events. In this example, we’ll create a basic frame and override the keyPressed() method from KeyAdapter to respond to key presses.

import java.awt.*;

import java.awt.event.*;

public class KeyAdapterExample {

    public static void main(String[] args) {

        Frame frame = new Frame("KeyAdapter Example");

        frame.setSize(400, 400);

        frame.setLayout(null);

        Label label = new Label("Press a key...");

        label.setBounds(150, 180, 100, 20);

        frame.add(label);

        // Add a KeyListener using KeyAdapter

        frame.addKeyListener(new KeyAdapter() {

            @Override

            public void keyPressed(KeyEvent e) {

                // Handle key press events

                int keyCode = e.getKeyCode();

                label.setText("Key code: " + keyCode);

            }

        });

        // Add a WindowListener to close the program

        frame.addWindowListener(new WindowAdapter() {

            @Override

            public void windowClosing(WindowEvent e) {

                System.exit(0); // Exit the program

            }

        });

        frame.setVisible(true);

    }

}

In this program:

We create a Frame named “KeyAdapter Example.”

We add a KeyAdapter to the frame using frame.addKeyListener(...).

The overridden keyPressed() method prints the key that was pressed.

We create a Label named “Press a key…” to display the key code.

The keyPressed() method updates the label text with the key code.We add a WindowListener using frame.addWindowListener(...).

The overridden windowClosing() method calls System.exit(0) to close the program when the window is closed.