This class is a trivial implementation of WindowListener; it provides empty bodies for each of the methods of that interface. When you are not interested in all of these methods, it is often easier to subclass WindowAdapter than it is to implement WindowListener from scratch.
public abstract class WindowAdapter extends Object implements WindowListener {
// Default Constructor: public WindowAdapter()
// Public Instance Methods
public void windowActivated(WindowEvent e); // From WindowListener
public void windowClosed(WindowEvent e); // From WindowListener
public void windowClosing(WindowEvent e); // From WindowListener
public void windowDeactivated(WindowEvent e); // From WindowListener
public void windowDeiconified(WindowEvent e); // From WindowListener
public void windowIconified(WindowEvent e); // From WindowListener
public void windowOpened(WindowEvent e); // From WindowListener
}
Object->WindowAdapter(WindowListener(EventListener))