keyevents.java

这是我们上java课时自己编的几个测试小程序

/**
 * @(#)KeyEvents.java
 *
 *
 * @author 
 * @version 1.00 2007/11/4
 */

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class KeyEvents extends Applet implements KeyListener
{	String msg="";
	int x=10,y=20;
	public void init()
	{	addKeyListener(this);
		requestFocus( );	}
	public void keyPressed(KeyEvent ke)
	{	showStatus("Key Down");
		int key=ke.getKeyCode();
		switch(key)	
		{    case KeyEvent.VK_F1:     msg+="<F1>";    break;
	              case KeyEvent.VK_F2:    msg+="<F2>";   break;	
                   case KeyEvent.VK_F3:    msg+="<F3>";   break;
     case KeyEvent.VK_PAGE_DOWN:   msg+="<PgDn>";  break;
	case KeyEvent.VK_PAGE_UP:          msg+="<PgUp>";  break;
	case KeyEvent.VK_LEFT:          msg+="<Left Arrow>";  break;
	case KeyEvent.VK_RIGHT:      msg+="<Right Arrow>"; break;
	}
	repaint( );
	}
     public void keyReleased(KeyEvent ke)
     {     showStatus("Key Up"); 	}
     public void keyTyped(KeyEvent ke)
     {     msg+=ke.getKeyChar();     repaint( );   }
     public void paint(Graphics g)
     {    g.drawString(msg,x,y);	}
}