KeyAdapter (Java SE 12 & JDK 12 )

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
Constructor Description

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 Detail
  - KeyAdapter
```
public KeyAdapter()
```
- Method Detail
  - 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