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Using Adapter Classes

An adapter class is a term for a class that implements a listener interface with methods that have no content (Ivor Horton's Beginning Java 2, JDK 5 Edition by Ivor Horton Wrox Press 2005) import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; public class Sketcher {   JFrame window = new JFrame("Sketcher");   public Sketcher() {     window.setBounds(30, 30, 300, 300);     window.addWindowListener(new WindowHandler());     window.setVisible(true);   }   class WindowHandler extends WindowAdapter {     public void windowClosing(WindowEvent e) {       System.out.println("closing");       window.dispose(); // Release the window resources       System.exit(0); // End the application     }   }   public static void main(String[] args) {     new Sketcher();   } }