Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Interface KeyListener - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Edition

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java.awt.event
Interface KeyListener

All Known Implementing Classes:: AWTEventMulticaster, KeyAdapter, BasicTableUI.KeyHandler

public interface KeyListener
extends EventListener

The listener interface for receiving keyboard events (keystrokes). The class that is interested in processing a keyboard event either implements this interface (and all the methods it contains) or extends the abstract KeyAdapter class (overriding only the methods of interest).

The listener object created from that class is then registered with a component using the component's addKeyListener method. A keyboard event is generated when a key is pressed, released, or typed (pressedn and released). The relevant method in the listener object is then invoked, and the KeyEvent is passed to it.

See Also:: KeyAdapter, KeyEvent, Tutorial: Writing a Key Listener, Reference: The Java Class Libraries (update file)

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.

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.

keyPressed

public void keyPressed(KeyEvent e)

Invoked when a key has been pressed.

keyReleased

public void keyReleased(KeyEvent e)

Invoked when a key has been released.