Java Code:
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.JFrame;

public class WindowAdapterTest {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Window Listener");
    WindowListener listener = new WindowAdapter() {
      public void windowClosing(WindowEvent w) {
        System.exit(0);
      }
    };
    frame.addWindowListener(listener);
    frame.setSize(300, 300);
    frame.show();
  }
}