keylistenerdemo.java

来自「java 完全探索的随书源码」· Java 代码 · 共 42 行

// KeyListenerDemo.java

import java.awt.*;
import java.awt.event.*;

class KeyListenerDemo extends Frame implements KeyListener
{
   KeyListenerDemo (String title)
   {
      super (title);

      addKeyListener (this);

      setSize (100, 100);

      setVisible (true);
   }

   public void keyPressed (KeyEvent e)
   {
      System.out.println ("Key pressed: virtual key code = "
                          + e.getKeyCode ());
   }

   public void keyReleased (KeyEvent e)
   {
      System.out.println ("Key released: virtual key code = "
                          + e.getKeyCode ());
   }

   public void keyTyped (KeyEvent e)
   {
      System.out.println ("Key typed: character = "
                          + e.getKeyChar ());
   }

   public static void main (String [] args)
   {
      new KeyListenerDemo ("Key Listener Demo");
   }
}