Write a program in Java to demonstrate window events.
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.*;

public class WindowExample extends JFrame implements WindowListener {
    WindowExample() {
        addWindowListener(this);

        setTitle("Window Events");
        setSize(500,400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        setLayout(null);
    }

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

    public void windowActivated(WindowEvent arg0) {
        System.out.println("activated");
    }

    public void windowClosed(WindowEvent arg0) {
        System.out.println("close");
    }

    public void windowClosing(WindowEvent arg0) {
        System.out.println("closing");
        dispose();
    }

    public void windowDeactivated (WindowEvent arg0) {
        System.out.println("deactivated");
    }

    public void windowDeiconified (WindowEvent arg0) {
        System.out.println("dignified");
    }

    public void windowIconified(WindowEvent arg0) {
        System.out.println("iconified");
    }

    public void windowOpened(WindowEvent arg0) {
        System.out.println("opened");
    }
}

Output
activated
opened
deactivated
activated
deactivated
activated
closing