AWT notes

Component	Event it generates
Button, TextField, List, Menu	ActionEvent
Frame	WindowEvent
Checkbox, Choice, List	ItemEvent
Scrollbar	AdjustmentEvent
Mouse (hardware)	MouseEvent
Keyboard (hardware)	KeyEvent

Listener Interface	Component
WindowListener	Frame
ActionListener	Button, TextField, List, Menu
ItemListener	Checkbox, Choice, List
AdjustmentListener	Scrollbar
MouseListener	Mouse (stable)
MouseMotionListener	Mouse (moving)
KeyListener	Keyboard

example 

public class ButtonDemo extends Frame implements ActionListener { public ButtonDemo() { Button btn = new Button("OK"); btn.addActionListener(this); add(btn); } public void actionPerformed(ActionEvent e) { String str = e.getActionCommand(); } }