| Class Summary | 
| Animation<Model> | An easy-to-use class for model/view GUI programs. | 
| MyKeyAdapter | The implementation of callbacks for the key events. | 
| MyMouseAdapter | The implementation of callbacks for the mouse events: 
 mouse clicked, entered, exited, pressed, and released. | 
| MyTimer | The action listener for the timer events. | 
| MyWindowClosingListener | The window closing listener - it stops the timer when the frame is closed
 and stops playing all tunes - in the tickTunes bucket and in the 
 keyTunes bucket. | 
| World | World for programming interactive games - with graphics, key events,
 mouse events and a timer. |