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/OpenJDK 21

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:

Constructor Summary

Modifier Constructor Description
protected
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

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/event/KeyAdapter.html