Module java.desktop

Package java.awt.event

Class KeyAdapter

java.lang.Object

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.

Since:

1.1

See Also:

• KeyEvent
• KeyListener
• Tutorial: Writing a Key Listener

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	KeyAdapter()	Constructs a KeyAdapter.

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.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

KeyAdapter

protected KeyAdapter()

Constructs a KeyAdapter.

Method Details

keyTyped

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

Parameters:

e - the event to be processed

keyPressed

public void keyPressed(KeyEvent e)

Invoked when a key has been pressed.

Specified by:

keyPressed in interface KeyListener

Parameters:

e - the event to be processed

keyReleased

public void keyReleased(KeyEvent e)

Invoked when a key has been released.

Specified by:

keyReleased in interface KeyListener

Parameters:

e - the event to be processed