Panel and JPanel

This class is the screen on to which drawing operations are directed.

JPanel can include components (buttons and the like) and can refine the method paint.
(The overridden method must invoke the parent method, in order to render features of the window not included in the user constructed portions).

class MyPanel extends JPanel {
	...
	public void paint (Graphics g) {
		super.paint(g);
		...
	}
}