Buttons, Sliders, Text Boxes, and so on

The user places an instance of a class into the window. Most use the listener event model to notify when they are changed.

	Button butn = new Button ("do it!");
	add("North", butn); // place at top of screen
	butn.addActionListener (new doIt()); // add listener
	..
	private class doIt implements ActionListener {
		public void actionPerformed (ActionEvent e) {
			// what ever do it does
			...
		}
	}