Module java.desktop

Package java.awt.event

Interface KeyListener

All Superinterfaces:

EventListener

All Known Implementing Classes:

AWTEventMulticaster, BasicComboBoxUI.KeyHandler, BasicComboPopup.InvocationKeyHandler, BasicTableUI.KeyHandler, BasicTreeUI.KeyHandler, KeyAdapter

public interface KeyListener
extends EventListener

The listener interface for receiving keyboard events (keystrokes). The class that is interested in processing a keyboard event either implements this interface (and all the methods it contains) or extends the abstract KeyAdapter class (overriding only the methods of interest).

The listener object created from that class is then registered with a component using the component's addKeyListener method. A keyboard event is generated when a key is pressed, released, or typed. The relevant method in the listener object is then invoked, and the KeyEvent is passed to it.

Since:

1.1

See Also:

• KeyAdapter
• KeyEvent
• Tutorial: Writing a Key Listener

Method Summary

Modifier and Type	Method	Description
void	keyPressed(KeyEvent e)	Invoked when a key has been pressed.
void	keyReleased(KeyEvent e)	Invoked when a key has been released.
void	keyTyped(KeyEvent e)	Invoked when a key has been typed.

Method Details

keyTyped

void keyTyped(KeyEvent e)

Invoked when a key has been typed. See the class description for KeyEvent for a definition of a key typed event.

Parameters:

e - the event to be processed

keyPressed

void keyPressed(KeyEvent e)

Invoked when a key has been pressed. See the class description for KeyEvent for a definition of a key pressed event.

Parameters:

e - the event to be processed

keyReleased

void keyReleased(KeyEvent e)

Invoked when a key has been released. See the class description for KeyEvent for a definition of a key released event.

Parameters:

e - the event to be processed