100分求助，按完OneMoreTime钮按后，再用键盘改变方向就不好使了

package 贪食蛇;

import javax.swing.*;



import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.Point;

import java.awt.event.*;



public class TestSnake extends JFrame 

					implements ActionListener{

	private JButton jbtOneMoreTime=new JButton("One more time");

	private JButton jbtExit=new JButton("Exit"); 

	TableLabel tl=new TableLabel();

	

    public TestSnake(){

    	

    	JPanel panel=new JPanel();

    	panel.setLocation(new Point(220,150));

        

    	panel.setLayout(new GridLayout(2,1,5,5));

    	panel.add(jbtOneMoreTime);

    	panel.add(jbtExit);

    	

    	add(tl,BorderLayout.CENTER);

    	add(panel,BorderLayout.EAST);

        

        

        //Register listener with buttons

        jbtOneMoreTime.addActionListener(this);

        jbtExit.addActionListener(this);

    }

    

    

    

    public void actionPerformed(ActionEvent e){

    	if(e.getSource()==jbtOneMoreTime){

    		Snakes s=tl.getSnakes();

    		s.setFocusable(true);

    		jbtOneMoreTime.setFocusable(false);



    		s.initial();

    	}

    		

    	else if(e.getSource()==jbtExit)

    		System.exit(0);

    }



    public static void main(String[] args) {

        // TODO 自动生成方法存根

        TestSnake frame=new TestSnake();

        

        frame.setTitle("Snakes1");

        frame.setSize(360,260);

        frame.setLocationRelativeTo(null);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

    }



}

package 贪食蛇;

import java.awt.*;

import java.util.*;

import java.awt.event.*;



import javax.swing.*;



public class Snakes extends JPanel{

	/**蛇的头*/

	private Point head=new Point(50,50);

	/**蛇的身体*/

	private ArrayList<Point> body=new ArrayList<Point>();

	/**蛇的方向*/

	private int oldDirection=RIGHT;

	private int newDirection=LEFT;

	/**蛇的生命状况*/

	boolean live=true;

	/**方向上*/

	public static final int UP=1;

	/**方向下*/

	public static final int DOWN=-1;

	/**方向左*/

	public static final int LEFT=2;

	/**方向右*/

	public static final int RIGHT=-2;

	/**分数*/

	private int score=0;

	/**蛇的运动速度*/

	private int speed;

	

	public Snakes(){

		head=new Point(50,50);

		body=new ArrayList<Point>();

		oldDirection=RIGHT;

		newDirection=LEFT;

		live=true;

		score=0;

		//body加上蛇的头部

		body.add(head);

		//body加上蛇的其他部分

		for(int i=40;i>=20;i-=10){

			body.add(new Point(i,50));

		}

		

		addKeyListener(new KeyAdapter(){

    		public void keyPressed(KeyEvent e){

    			switch(e.getKeyCode()){

    			case KeyEvent.VK_UP:    newDirection=UP;   break;

    			case KeyEvent.VK_DOWN:  newDirection=DOWN; break;

    			case KeyEvent.VK_LEFT:  newDirection=LEFT; break;

    			case KeyEvent.VK_RIGHT: newDirection=RIGHT;break;

    			default:  break;

    			}

    		}

    	});

	}

	

	/**蛇的运动*/

	public void move(){

		if(live){

			for(int i=body.size()-1;i>=1;i--){

				bodyMove(body.get(i-1),body.get(i));

			}

			switch(oldDirection){

			case UP:    head.translate(0, -10);  break;

			case DOWN:  head.translate(0, 10);   break;

			case LEFT:  head.translate(-10, 0);  break;

			case RIGHT: head.translate(10, 0);   break;

			default: break;

			}

		}

	}

	

	/**改变蛇的运动方向*/

	public void changeDirection(){

		if(live){

			if(oldDirection+newDirection!=0){

				oldDirection=newDirection;

			}

		}

	}

	

	/**蛇有没有吃到苹果*/

	public boolean isEatApple(Apple a){

		if(head.equals(a.getPoint())){

			score+=10;

			return true;

		}

		else

			return false;

	}

	

	/**获取蛇头*/

	public Point getHead(){

		return head;

	}

	

	/**获取newDIrection*/

	public int getNewDirection(){

		return newDirection;

	}

	

	/**比较两个Point的相对位置,并将后一个Point移动到前一个Point的位置*/

	public void bodyMove(Point previous,Point current){

		if(current.getX()!=previous.getX()){

			int temp=(int) (previous.getX()-current.getX());

			current.translate(temp, 0);

		}

		

		if(current.getY()!=previous.getY()){

			int temp=(int) (previous.getY()-current.getY());

			current.translate(0,temp);

		}

	}

	

	/**获取body*/

	public ArrayList<Point> getBody(){

		return body;

	}

	

	/**获取蛇的尾巴*/

	public Point getTail(){

		return body.get(body.size()-1);

	}

	

	/**检查有没有吃到自己*/

	public boolean isEatItself(){

		for(int i=1;i<body.size()-1;i++){

			if(head.equals(body.get(i)))

				return true;

		}

		return false;

	}

	

	/**判断蛇有没有撞墙*/

	public boolean isBeyondBound(){

		if(head.x>=220||head.y>=220||

				head.x<0||head.y<0)

			return true;

		else

			return false;

	}

	

	public int getScore(){

		return score;

	}

	

	public void initial(){

		head=new Point(50,50);

		body=new ArrayList<Point>();

		oldDirection=RIGHT;

		newDirection=LEFT;

		live=true;

		score=0;

		//body加上蛇的头部

		body.add(head);

		//body加上蛇的其他部分

		for(int i=40;i>=20;i-=10){

			body.add(new Point(i,50));

		}

		

		this.addKeyListener(new KeyAdapter(){

    		public void keyPressed(KeyEvent e){

    			switch(e.getKeyCode()){

    			case KeyEvent.VK_UP:    newDirection=UP;   break;

    			case KeyEvent.VK_DOWN:  newDirection=DOWN; break;

    			case KeyEvent.VK_LEFT:  newDirection=LEFT; break;

    			case KeyEvent.VK_RIGHT: newDirection=RIGHT;break;

    			default:  break;

    			}

    		}

    	});

	}

	

}