Java™ Platform
Standard Ed. 6

Class KeyAdapter

  extended by java.awt.event.KeyAdapter
All Implemented Interfaces:
KeyListener, EventListener
Direct Known Subclasses:
BasicComboBoxUI.KeyHandler, BasicComboPopup.InvocationKeyHandler, BasicTreeUI.KeyHandler

public abstract class KeyAdapter
extends Object
implements KeyListener

An abstract adapter class for receiving keyboard events. The methods in this class are empty. This class exists as convenience for creating listener objects.

Extend this class to create a KeyEvent listener and override the methods for the events of interest. (If you implement the KeyListener interface, you have to define all of the methods in it. This abstract class defines null methods for them all, so you can only have to define methods for events you care about.)

Create a listener object using the extended class and then register it with a component using the component's addKeyListener method. When a key is pressed, released, or typed, the relevant method in the listener object is invoked, and the KeyEvent is passed to it.

See Also:
KeyEvent, KeyListener, Tutorial: Writing a Key Listener

Constructor Summary
Method Summary
 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.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public KeyAdapter()
Method Detail


public void keyTyped(KeyEvent e)
Invoked when a key has been typed. This event occurs when a key press is followed by a key release.

Specified by:
keyTyped in interface KeyListener


public void keyPressed(KeyEvent e)
Invoked when a key has been pressed.

Specified by:
keyPressed in interface KeyListener


public void keyReleased(KeyEvent e)
Invoked when a key has been released.

Specified by:
keyReleased in interface KeyListener

Java™ Platform
Standard Ed. 6

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright © 1993, 2010, Oracle and/or its affiliates. All rights reserved.