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

    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 Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • 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