这个到底是哪出了问题

import java.awt.*;
import java.util.*;
import java.awt.event.ActionEvent.*;
import static java.util.EventObject.*;
import javax.swing.Timer;
import java.awt.event.KeyAdapter.*;
import static java.awt.AWTEvent.*;
public class PinBall
{
//桌面的宽度
private final int TABLE_WIDTH=300;
//桌面的高度
private final int TABLE_HEIGHT=400;
//球拍的垂直位置
private final int RACKET_Y=340;
//下面定义球拍的高度和宽度
private final int RACKET_HEIGHT=20;
private final int RACKET_WIDTH=60;
//小球的大小
private final int BALL_SIZE=16;
private Frame f =new Frame("弹球游戏");
Random rand=new Random();
//小球纵向的运行速度
private int ySpeed=10;
//返回一个-0.5-0.5的比率,用于控制小球的运行方向
private double xyRate=rand.nextDouble() - 0.5;
//小球横向的运行速度
private int xSpeed=(int)(ySpeed * xyRate * 2);
//ballx和bally代表小球的坐标
private int ballx=rand.nextInt(200)+20;
private int bally=rand.nextInt(10)+20;
    //racketX代表球拍的水平位置
private int racketX=rand.nextInt(200);
    private MyCanvas tableArea=new MyCanvas();
//用于保存需要绘制什么图形的字符串属性
private String shape="";
Timer timer;
//游戏是否结束的旗标
private boolean isLose=false;//963446064
public void init()
    {
    tableArea.setPreferredSize(new Dimension(TABLE_WIDTH,TABLE_HEIGHT));
    f.add(tableArea);
    //定义键盘监听器
    KeyAdapter keyProcessor=new KeyAdapter()
        {
        public void keyPressed(KeyEvent ke)
            {
            //按下向左、向右键时，球拍水平坐标分别减少、增加
            if (ke.getKeyCode()==KeyEvent.VK_LEFT)
            {
            if(racketX>0)
                racketX-=10;
            }
            if(ke.getkeycode()==KeyEvent.VK_RIGHT)
                {
                if(racketX<TABLE_WIDTH-RACKEY_WIDTH)
                    racketX+=10;
                }
            }
        };

        //为窗口和tableArea对象分别添加键盘监听器
        f.addKeyListener(keyProcessor);
        tableArea.addkeyListener(keyProcessor);
        //定义每0.1秒执行一次的时间监听器。
        ActionListener taskPerformer=new ActionListener()
        {
            public void actionPerformed(ActionEvent evt)
            {
                //如果小球碰到左边边框
                if(ballx<0||ballx>=TABLE_WIDTH-BALL_SIZE)
                {
                    xSpeed=-xSpeed;
                }
                //如果小球高度超出了球拍位置，且横向不在球拍范围内，游戏结束。
                if(ballx>=RACKET_Y-BALL_SIZE&&
                    (ballX<racketX||ballX>racketX+RACKET_WIDTH))
                {
                    timer.stop();
                    //设置游戏是否结束的旗标为true.
                    isLose=true;
                    tableArea.repaint();
                }
                //如果小球位于球拍之内，且到达球拍位置，小球反弹
                else if (bally<=0||
                    (bally>=RACKET_Y-BALL_Size
                    &&ballX>racketX&&ballX<=racketX+RACKET_WIDTH))
                {
                    ySpeed=-ySpeed;
                }
                //小球坐标增加
                bally+=ySpeed;
                ballX+=xSpeed;
                tableArea.repaint();
            }
        };
        timer=new Timer(100,taskPerformer);
        timer.start();
        f.setVisible(true);

    }
    public static void main(String[]args)
    {
        new PinBall().init();
    }
    class MyCanvas extends Canvas
    {
        //重写Canvas的paint方法，实现绘画
        public void paint(Graphics g)
        {
            //如果游戏已经结束
            if(isLose)
            {
                g.setColor(new Color(255,0,0));
                g.setFont(new Font("Times",Font.BOLD,30));
                g.drawString("游戏已结束!",50,200);
                    }
                //如果游戏还未结束
                else
            {
                    //设置颜色，并绘制小球
                    g.setColor(new Color(240,240,80));
                    g.fillOval(ballx,bally,BALL_SIZE,BALL_SIZE);
                    //设置颜色，并绘制球拍
                    g.setColor(new Color(80,80,200));
                    g.fillRect(racketX,RACKET_Y,RACKET_WIDTH,RACKET_HEIGHT);
            }
        }
    }
}
            
            
            
            
   
   
               
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