Java

, 8.8 Painting with Swing 129

System. exit (0) ;

The listener registration is performed by the statement

this. addWindowListener(new MyWindowAdapter() ) ;

Note we do not register the application object to act as a listener, but an instance of the

MyWindowAdapter class. The component for which we are registering a listener is the component

involved when a user shuts the main window. This component is the current frame instance,

identified by the keyword this.

If we create only a single object of the

MyWindowAdapter

class, we can dispense with giving

the adapter subclass a name by using an anonymous inner class. We can ...