testkeyclicked.java

Java语言

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class TestKeyClicked extends Applet{
   Color clr;
   public void init(){
       addKeyListener(new KeyClicked());
       requestFocus();
   }
   class KeyClicked extends KeyAdapter{
	   public void keyTyped(KeyEvent e){
	      if(e.getKeyChar()=='r'||e.getKeyChar()=='R')
	         clr=Color.red;
	      else if(e.getKeyChar()=='g'||e.getKeyChar()=='G')
	         clr=Color.green;
	      else if(e.getKeyChar()=='b'||e.getKeyChar()=='B')
	         clr=Color.blue;
	      else
	         clr=null;
	      setBackground(clr);
	   }
   }   
}