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
Constructors
| Constructor and Description |
|---|
KeyAdapter() |
Methods
| Modifier and Type | Method and 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 inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait Constructors
KeyAdapter
public KeyAdapter()
Methods
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:
-
keyTypedin interfaceKeyListener
keyPressed
public void keyPressed(KeyEvent e)
Invoked when a key has been pressed.
- Specified by:
-
keyPressedin interfaceKeyListener
keyReleased
public void keyReleased(KeyEvent e)
Invoked when a key has been released.
- Specified by:
-
keyReleasedin interfaceKeyListener
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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/javase/8/docs/api/java/awt/event/KeyAdapter.html