我的是这样的啊!那里错啦.请各位看看!!

import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class CanvasTest extends Canvas implements KeyListener
 {
     int index;
     Color color[]={Color.red,Color.green,Color.blue};
     public void paint(Graphics g)
     {
         g.setColor(color[index]);
         g.fillRect(0,0,getSize().width,getSize().height);
     }
     
   
    public static void main(String[] args) {
        Frame f=new Frame("Canavs");
        CanvasTest mc=new CanvasTest();
        f.add(mc,BorderLayout.CENTER);
        f.setSize(200,200);
        mc.requestFocus();
        mc.addKeyListener(mc);
        f.setVisible(true);
    }
    public void keyTyped(KeyEvent ev)
    {
        index++;
        if (index==color.length)
        {
            index =0;
            
        }
        repaint();
    }
    public void keyReleased(KeyEvent ev){ }
    public void keyPreeed(KeyEvent ev){ }
}
编译出错!!

Command   : "C:\Program Files\Java\jdk1.6.0_03\bin\javac.exe" -classpath "C:\Program Files\Xinox Software\JCreatorV4\MyProjects\ChTest\CanvasTest\classes\;C:\Program Files\Java\jdk1.6.0_03\jre\lib\rt.jar;C:\Program Files\Java\jdk1.6.0_03\lib\dt.jar;C:\Program Files\Java\jdk1.6.0_03\lib\tools.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.6.0_03\lib;C:\Program Files\Java\jdk1.6.0_03\bin;C:\Program Files\Java\jre1.6.0_03\lib" -d "C:\Program Files\Xinox Software\JCreatorV4\MyProjects\ChTest\CanvasTest\classes" @src_canvastest.txt
Directory : "C:\Program Files\Xinox Software\JCreatorV4\MyProjects\ChTest\CanvasTest"

C:\Program Files\Xinox Software\JCreatorV4\MyProjects\ChTest\CanvasTest\src\CanvasTest.java:12: CanvasTest 不是抽象的，并且未覆盖 java.awt.event.KeyListener 中的抽象方法 keyPressed(java.awt.event.KeyEvent)
public class CanvasTest extends Canvas implements KeyListener
       ^
1 错误

Process completed.