废话不多说咯，直接上代码，求上墙：

格子类

package engorgesnake;
       import java.awt.p_w_picpath.BufferedImage;
       /**
        * 这是一个小方格类，它可以组成贪吃蛇，也可以是食物 它有row col Image三个属性
        * 还重写了toString方法
        *
        * @author yufeng
        *
        */
       public class Cell {
       private int row;
       private int col;
       private BufferedImage Image;
       public Cell(){}
       public Cell(int row, int col, BufferedImage p_w_picpath) {
       super();
       this.row = row;
       this.col = col;
       this.Image = p_w_picpath;
       }
       @Override
       public int hashCode() {
       final int prime = 31;
       int result = 1;
       result = prime * result + col;
       result = prime * result + row;
       return result;
       }
       @Override
       public boolean equals(Object obj) {
       if (this == obj)
       return true;
       if (obj == null)
       return false;
       if (getClass() != obj.getClass())
       return false;
       Cell other = (Cell) obj;
       if (col != other.col)
       return false;
       if (row != other.row)
       return false;
       return true;
       }
       public int getRow() {
       return row;
       }
       public void setRow(int row) {
       this.row = row;
       }
       public int getCol() {
       return col;
       }
       public void setCol(int col) {
       this.col = col;
       }
       public BufferedImage getImage() {
       return Image;
       }
       public void setImage(BufferedImage p_w_picpath) {
       this.Image = p_w_picpath;
       }
       public String toString() {
       return "(" + row + "," + col /*+","+Image*/+")";
       }
       }

蛇类和食物类：

package engorgesnake;
      import java.awt.p_w_picpath.BufferedImage;
      import java.util.LinkedList;
      import java.util.List;
      import java.util.Random;
      /**
       * 这时一个描述蛇的类
       * @author yufeng
       *
       */
      public class Snake extends LinkedList<Cell>{
      private static final long serialVersionUID = 1L;
      private List<Cell> snake=new LinkedList<Cell>();
      public Snake(List<Cell> snake) {
      this.snake = snake;
      }
      public List<Cell> getSnake() {
      return snake;
      }
      public void setSnake(List<Cell> snake) {
      this.snake = snake;
      }
      /**
      * 可以通过类名调用该方法生成蛇
      * @return 一条长度为3的蛇
      */
      public static Snake start1(){
      Snake snake=new Snake(new LinkedList<Cell>());
      snake.add(new Cell(20,2,Game.snakeHead));
      snake.add(new Cell(20,1,Game.snakeImage));
      snake.add(new Cell(20,0,Game.snakeTail));
      return snake;
      }     
      public static Snake start2(){
      Snake snake=new Snake(new LinkedList<Cell>());
      snake.add(new Cell(20,57,Game.snakeHead));
      snake.add(new Cell(20,58,Game.snakeImage));
      snake.add(new Cell(20,59,Game.snakeTail));
      return snake;
      }
      /**
      * 去掉蛇的尾部元素，并且把蛇集合小标为1的元素图片设置为蛇身图片
      * @param snake
      */
      public void move(Snake snake){
      snake.remove(snake.size()-1);
      snake.get(1).setImage(Game.snakeImage);
      snake.get(snake.size()-1).setImage(Game.snakeTail);
      }
      /**
      * 蛇左移
      * @param snake
      */
      public void moveLeft(Snake snake){
               
      snake.add(0,new Cell(snake.get(0).getRow(),snake.get(0).getCol()-1,Game.snakeHead));
      snake.move(snake);
      }
      /**
      * 蛇右移
      * @param snake
      */
      public void moveRight(Snake snake){
      snake.add(0,new Cell(snake.get(0).getRow(),snake.get(0).getCol()+1,Game.snakeHead));
      snake.move(snake);
      }   
      /**
      * 蛇上移
      * @param snake
      */
      public void moveUp(Snake snake){
      snake.add(0,new Cell(snake.get(0).getRow()-1,snake.get(0).getCol(),Game.snakeHead));
      snake.move(snake);
      }   
      /**
      * 蛇下移
      * @param snake
      */
      public void moveDown(Snake snake){
      snake.add(0,new Cell(snake.get(0).getRow()+1,snake.get(0).getCol(),Game.snakeHead));
      snake.move(snake);
      }
      /**
      * 吃食物的方法
      * @param snake
      * @param str
      */
      public void eatFood(Snake snake,String str){
      if("up".equals(str)){
      snake.add(0,new Cell(snake.get(0).getRow()-1,snake.get(0).getCol(),Game.snakeHead));
      snake.get(1).setImage(Game.snakeImage);
      }else if("down".equals(str)){
      snake.add(0,new Cell(snake.get(0).getRow()+1,snake.get(0).getCol(),Game.snakeHead));
      snake.get(1).setImage(Game.snakeImage);
      }else if("left".equals(str)){
      snake.add(0,new Cell(snake.get(0).getRow(),snake.get(0).getCol()-1,Game.snakeHead));
      snake.get(1).setImage(Game.snakeImage);
      }else if("right".equals(str)){
      snake.add(0,new Cell(snake.get(0).getRow(),snake.get(0).getCol()+1,Game.snakeHead));
      snake.get(1).setImage(Game.snakeImage);
      }      
      }
      }
      /**
       * 这是一个描述食物的类
       * @author yufeng
       *
       */
      class Food extends Cell{
      private int row;
      private int col;
      private BufferedImage Image;     
      public int getRow() {
      return row;
      }    
      public void setRow(int row) {
      this.row = row;
      }    
      public int getCol() {
      return col;
      }
      public void setCol(int col) {
      this.col = col;
      }
      public BufferedImage getImage() {
      return Image;
       }
      public void setImage(BufferedImage p_w_picpath) {
      Image = p_w_picpath;
      }
      public Food(int row, int col, BufferedImage p_w_picpath) {
      super();
      this.row = row;
      this.col = col;
      Image = p_w_picpath;
      }
      public String toString() {
      return "(" + row + "," + col + ")";
      }
      @Override
      public int hashCode() {
      final int prime = 31;
      int result = super.hashCode();
      result = prime * result + col;
      result = prime * result + row;
      return result;
      }
      @Override
      public boolean equals(Object obj) {
      if (this == obj)
      return true;
      if (!super.equals(obj))
      return false;
      if (getClass() != obj.getClass())
      return false;
      Food other = (Food) obj;
      if (col != other.col)
      return false;
      if (row != other.row)
      return false;
      return true;
      }
      public Food(){}
      /**
      * 这个是食物随机生成的方法
      * @return
      */
      public static Food getFood(){
      Food food=new Food();
      Random random=new Random();
      int x=random.nextInt(Game.ROWS);
      int y=random.nextInt(Game.COLS);
      food.setRow(x);
      food.setCol(y);
      return food;
      }
      }

  游戏类：

package engorgesnake;
        import java.awt.Color;
        import java.awt.Font;
        import java.awt.Graphics;
        import java.awt.event.KeyAdapter;
        import java.awt.event.KeyEvent;
        import java.awt.p_w_picpath.BufferedImage;
        import java.io.IOException;
        import java.util.Arrays;
        import java.util.Collections;
        import java.util.Timer;
        import java.util.TimerTask;
        import javax.p_w_picpathio.ImageIO;
        import javax.management.RuntimeErrorException;
        import javax.swing.JFrame;
        import javax.swing.JPanel;
        /**
         * 游戏类扩展了系统的现实面板
         * @author yufeng
         *
         */
        public class Game extends JPanel{
        public static final int ROWS = 40;
        public static final int COLS = 60;
        public static final int CELL_SIZE = 10;
        private Cell[][] wall = new Cell[ROWS][COLS];
        private Snake snake1;
        private Snake snake2;
        private Food food1;
        private Food food2;
        private int SCORE;
        private String str;
        private int level=50;
        private int index=0;
        private boolean gameover=false;
        private boolean pause=false;
        private Timer timer = new Timer();
        public static BufferedImage background;
        public static BufferedImage snakeHead;
        public static BufferedImage snakeImage;
        public static BufferedImage snakeTail;
        public static BufferedImage gameOver;
        /*
        * 获取图片资源
        */
        static{
        try {
        background=ImageIO.read(Game.class.getResource("background.jpg"));
        snakeHead=ImageIO.read(Game.class.getResource("SnakeHead.jpg"));
        snakeImage=ImageIO.read(Game.class.getResource("SnakeImage.jpg"));
        snakeTail=ImageIO.read(Game.class.getResource("SnakeTail.jpg"));
        gameOver=ImageIO.read(Game.class.getResource("gameover.png"));
        } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        }
        }
        public void paint(Graphics g){
        /*
        * 绘制背景贴图
        */
        g.drawImage(background, 0, 0, null);
        g.translate(11, 11);
        /*
        * 绘制墙
        */
        paintWall(g);
        /*
        * 绘制蛇
        */
        paintSnake(g);
        /*
        * 绘制食物
        */
        paintFood(g);
        /*
        * 绘制分数
        */
        paintScore(g);
        }
        /**
        * 绘制分数的方法
        * @param g
        */
        private void paintScore(Graphics g) {
        Font font = new Font(getFont().getName(), Font.BOLD, 36);
        g.setColor(Color.gray);
        g.setFont(font);
        String str = "" + this.SCORE;
        g.drawString(str, 650, 370);
        g.setColor(Color.gray);
        g.setFont(font);
        str=""+this.str;
        g.drawString(str, 670, 115);
        if(!pause&&!gameover){
        g.setColor(Color.gray);
        g.setFont(font);
        str="[P]暂停";
        g.drawString(str, 635, 242);
        }
        if(pause&&!gameover){
        g.setColor(Color.gray);
        g.setFont(font);
        str="[C]继续";
        g.drawString(str, 635, 242);
        }
        if(gameover){
        g.drawImage(gameOver, 0, 0, null);
        font = new Font(getFont().getName(), Font.BOLD, 26);
        g.setColor(Color.gray);
        g.setFont(font);
        str="[R]重新游戏";
        g.drawString(str, 625, 242);
        }
        }
        /**
    * 绘制食物的方法
        * @param g
        */
        private void paintFood(Graphics g) {
        // TODO Auto-generated method stub
        if(food1==null||food2==null){
        return;
        }
        int row1=food1.getRow();
        int col1=food1.getCol();
        int row2=food2.getRow();
        int col2=food2.getCol();
        int x1=col1*CELL_SIZE;
        int y1=row1*CELL_SIZE;
        int x2=col2*CELL_SIZE;
        int y2=row2*CELL_SIZE;
        g.drawImage(snakeImage,x1,y1,null);
        g.drawImage(snakeImage,x2,y2,null);
        }
        /**
        * 绘制蛇的方法
        * @param g
        */
        private void paintSnake(Graphics g) {
        // TODO Auto-generated method stub
        if(snake1==null&&snake2==null){
        return;
        }
        for(int i=snake1.size()-1;i>=0;i--){
        Cell cells=snake1.get(i);
        int row=cells.getRow();
        int col=cells.getCol();
        int x=col*CELL_SIZE;
        int y=row*CELL_SIZE;
        g.drawImage(cells.getImage(), x, y, null);
        }
        for(int i=snake2.size()-1;i>=0;i--){
        Cell cells=snake2.get(i);
        int row=cells.getRow();
        int col=cells.getCol();
        int x=col*CELL_SIZE;
        int y=row*CELL_SIZE;
        g.drawImage(cells.getImage(), x, y, null);
        }
        }
        /**
        * 绘制墙，背景图片
        * @param g
        */
        private void paintWall(Graphics g) {
        // TODO Auto-generated method stub
        for (int row = 0; row < wall.length; row++) {
        Cell[] line = wall[row];
        for (int col = 0; col < line.length; col++) {
        Cell cell = line[col];
        int x = CELL_SIZE * col;
        int y = CELL_SIZE * row;
        /*g.drawRect(x, y, CELL_SIZE, CELL_SIZE);*/
        if (cell != null) {
        // 如果有砖块 把砖块的图片贴在x，y的位置上
        g.drawImage(cell.getImage(), x, y, null);
        }
        }
        }
        }
        /**
        * 这个是本游戏的流程控制（包括各种功能）的代码
        */
        private void action(){
        // TODO Auto-generated method stub
        startGameAction();
        KeyAdapter l = new KeyAdapter() {
        public void keyPressed(KeyEvent e) {
        final int key = e.getKeyCode();
        if (key == KeyEvent.VK_Q) {
        System.exit(0);
        }
        if(gameover){
        if(key==KeyEvent.VK_R){
        clearAll();
        }
        return;
        }
        if(pause){
        if(key==KeyEvent.VK_C){
        pause=false;
        }
        return;
        }
        switch (key) {
        case KeyEvent.VK_DOWN:
        snake_MoveDown(snake2, snake1, food1, food2);
        break;
        case KeyEvent.VK_RIGHT:
        snake_MoveRight(snake2, snake1, food1, food2);
        break;
        case KeyEvent.VK_LEFT:
        snake_MoveLeft(snake2, snake1, food1, food2);
        break;
        case KeyEvent.VK_UP:
        snake_MoveUp(snake2, snake1, food1, food2);
        break;
        case KeyEvent.VK_S:
        snake_MoveDown(snake1, snake2, food1, food2);
        break;
        case KeyEvent.VK_D:
        snake_MoveRight(snake1, snake2, food1, food2);
        break;
        case KeyEvent.VK_A:
        snake_MoveLeft(snake1, snake2, food1, food2);
        break;
        case KeyEvent.VK_W:
        snake_MoveUp(snake1, snake2, food1, food2);
        break;
        case KeyEvent.VK_P:
        pause=true;
        break;
        default:
        break;
        }
        repaint();
        }
        };
        this.addKeyListener(l);
        this.requestFocus();
        /**
        * 启动主刷新
        */
        timer.schedule(new TimerTask() {
        public void run() {
        if(!pause&&!gameover){
        index++;
        if (index % level == 0) {
        move(snake1, snake2, food1, food2);
        move(snake2, snake1, food1, food2);
        }
        if(SCORE<200){
        str="初级";
        level=50;
        }else if(SCORE<400){
        str="中级";
        level=30;
        }else if(SCORE<600){
        str="高级";
        level=15;
        }else{
        str="终极";
        level=5;
        }
        }
        repaint();
        }
        }, 0, 10);
        }
        /**
         * 重新游戏，需要把游戏结束的画面全部清空，再重新开始游戏
         */
        protected void clearAll() {
        for(Cell[] cells:wall){
        Arrays.fill(cells, null);
        }
        startGameAction();
        pause=false;
        gameover=false;
        }
        /**
         * 蛇移动的方法，这里主要是对参数snake1移动
         * @param snake1
         * @param snake2
         * @param food1
         * @param food2
         */
        protected void move(Snake snake1,Snake snake2,Food food1,Food food2){
        if(canDown(snake1)){
        snake_MoveDown(snake1, snake2,food1,food2);
        }else if(canUp(snake1)){
        snake_MoveUp(snake1,snake2,food1,food2);/*}*/
        }else if(canLeft(snake1)){
        snake_MoveLeft(snake1,snake2,food1,food2);/*}*/
        }else if(canRight(snake1) ){
        snake_MoveRight(snake1,snake2,food1,food2);/*}*/
        }else{
        if(gameover){
        gameOverAction();
        }
        }
        }
        /**
         * 这个是游戏结束的方法，停止计时
         */
        private void gameOverAction() {
        // TODO Auto-generated method stub
        timer.cancel();
        }
        /**
         * 判断参数snake是否能够向右移动
         * @param snake
         * @return 能向右移动  返回true
         * 不能则返回false
         */
        private boolean canRight(Snake snake) {
        if(snake.get(0).getRow()==snake.get(1).getRow()&&snake.get(0).getCol()>snake.get(1).getCol()){
        return true;
        }
        return false;
        }
        /**
         * 判断参数snake能否向左移动
         * @param snake
         * @return
         */
        private boolean canLeft(Snake snake) {
        if(snake.get(0).getRow()==snake.get(1).getRow()&&snake.get(0).getCol()<snake.get(1).getCol()){
        return true;
        }
        return false;
        }
        private boolean canUp(Snake snake) {
        if(snake.get(0).getCol()==snake.get(1).getCol()&&snake.get(0).getRow()<snake.get(1).getRow()){
        return true;
        }
        return false;
        }
        private boolean canDown(Snake snake) {
        if(snake==null){
        return false;
        }
        if(snake.get(0).getCol()==snake.get(1).getCol()&&snake.get(0).getRow()>snake.get(1).getRow()){
        return true;
        }
        return false;
        }
        /**
         * 参数snakeA上移的方法
         * @param snakeA
         * @param snakeB
         * @param foodA
         * @param foodB
         */
        protected void snake_MoveUp(Snake snakeA,Snake snakeB,Food foodA,Food foodB) {
        if((snakeA.get(0).getCol()==foodA.getCol()&&(snakeA.get(0).getRow()-1==foodA.getRow()))
        ||(snakeA.get(0).getCol()==foodB.getCol()&&(snakeA.get(0).getRow()-1==foodB.getRow()))){
        snakeA.eatFood(snakeA, "up");
        updateFood(foodA,foodB,snakeA,snakeB,"up");
        repaint();
        SCORE+=10;
        }else if (canMove(snakeA,snakeB)&& (snakeA.get(0).getRow() < snakeA.get(1).getRow()
        ||snakeA.get(0).getRow()==snakeA.get(1).getRow()) ){
        snakeA.moveUp(snakeA);
        }
        if(!canMove(snakeA,snakeB)){
        snakeA.remove(0);
        snakeB.remove(0);
        gameOver();
        }
        }
        /**
        * 参数snakeA左移的方法
        * @param snakeA
        * @param snakeB
        * @param foodA
        * @param foodB
        */
        protected void snake_MoveLeft(Snake snakeA,Snake snakeB,Food foodA,Food foodB) {
        if((snakeA.get(0).getCol()-1==foodA.getCol()&&(snakeA.get(0).getRow()==foodA.getRow()))
        ||(snakeA.get(0).getCol()-1==foodB.getCol()&&(snakeA.get(0).getRow()==foodB.getRow()))){
        snakeA.eatFood(snakeA, "left");
        updateFood(foodA,foodB,snakeA,snakeB,"left");
        repaint();
        SCORE+=10;
        }
        else if(canMove(snakeA,snakeB)&&  (snakeA.get(0).getCol() < snakeA.get(1).getCol()
        ||snakeA.get(0).getCol()==snakeA.get(1).getCol())) {
        snakeA.moveLeft(snakeA);
        }
        if(!canMove(snakeA,snakeB)){
        snakeA.remove(0);
        snakeB.remove(0);
        gameOver();
        }
        }
        /**
         * 当食物被吃了，更新食物的方法
         * @param foodA
         * @param foodB
         * @param snakeA
         * @param snakeB
         * @param str
         */
        private void updateFood(Food foodA,Food foodB,Snake snakeA,Snake snakeB,String str) {
        /**
        * 假如2个食物都被吃了，则生成2个食物
        */
        if((foodA.getRow()==snakeA.get(0).getRow()&&foodA.getCol()==snakeA.get(0).getCol())
        &&foodB.getRow()==snakeB.get(0).getRow()&&foodB.getCol()==snakeB.get(0).getCol()){
        Food food1=getFoods(snakeA, snakeB);
        Food food2=getFoods(snakeA, snakeB, food1);
        foodA.setRow(food1.getRow());
        foodA.setCol(food1.getCol());
        foodB.setRow(food2.getRow());
        foodB.setCol(food2.getCol());
        }
        if((foodA.getRow()==snakeB.get(0).getRow()&&foodA.getCol()==snakeB.get(0).getCol())
        &&foodB.getRow()==snakeA.get(0).getRow()&&foodB.getCol()==snakeA.get(0).getCol()){
        Food food1=getFoods(snakeA, snakeB);
        Food food2=getFoods(snakeA, snakeB, food1);
        foodA.setRow(food1.getRow());
        foodA.setCol(food1.getCol());
        foodB.setRow(food2.getRow());
        foodB.setCol(food2.getCol());
        }
        /**
        * 假如被吃了一个
        */
        if(foodA.getRow()==snakeA.get(0).getRow()&&foodA.getCol()==snakeA.get(0).getCol()){
        Food food=getFoods(snakeA,snakeB,foodB);
        foodA.setRow(food.getRow());
        foodA.setCol(food.getCol());
        }
        if(foodB.getRow()==snakeA.get(0).getRow()&&foodB.getCol()==snakeA.get(0).getCol()){
        Food food=getFoods(snakeA,snakeB,foodA);
        foodB.setRow(food.getRow());
        foodB.setCol(food.getCol());
        }
        }
        /**
         * 参数snakeA右移的方法
         * @param snakeA
         * @param snakeB
         * @param foodA
         * @param foodB
         */
        protected void snake_MoveRight(Snake snakeA,Snake snakeB,Food foodA,Food foodB) {
        if((snakeA.get(0).getCol()+1==foodA.getCol()&&(snakeA.get(0).getRow()==foodA.getRow()))
        ||(snakeA.get(0).getCol()+1==foodB.getCol()&&(snakeA.get(0).getRow()==foodB.getRow()))){
        snakeA.eatFood(snakeA, "right");
        updateFood(foodA,foodB,snakeA,snakeB,"right");
        repaint();
        SCORE+=10;
        }else if(canMove(snakeA,snakeB)&&  (snakeA.get(0).getCol() > snakeA.get(1).getCol()
        ||snakeA.get(0).getCol()==snakeA.get(1).getCol())) {
        snakeA.moveRight(snakeA);
        }
        if(!canMove(snakeA,snakeB)){
        snakeA.remove(0);
        snakeB.remove(0);
        gameOver();
        }
        }
        /**
        * 参数snakeA下移的方法
        * @param snakeA
        * @param snakeB
        * @param foodA
        * @param foodB
        */
        protected void snake_MoveDown(Snake snakeA,Snake snakeB,Food foodA,Food foodB) {
        if((snakeA.get(0).getCol()==foodA.getCol()&&(snakeA.get(0).getRow()+1==foodA.getRow()))
        ||(snakeA.get(0).getCol()==foodB.getCol()&&(snakeA.get(0).getRow()+1==foodB.getRow()))){
        snakeA.eatFood(snakeA, "down");
        updateFood(foodA,foodB,snakeA,snakeB,"down");
        repaint();
        SCORE+=10;
        }
        else if(canMove(snakeA,snakeB)&& (snakeA.get(0).getRow() > snakeA.get(1).getRow()
        ||snakeA.get(0).getRow()==snakeA.get(1).getRow()) ){
        snakeA.moveDown(snakeA);
        }
        if(!canMove(snakeA,snakeB)){
        snakeA.remove(0);
        snakeB.remove(0);
        gameOver();
        }
        }
        /**
        * 游戏结束，gameover重新赋值true
        */
        private void gameOver() {
        gameover=true;
        }
        private boolean canMove(Snake snakeA,Snake snakeB){
        if(outOfBounds(snakeB)||outOfBounds(snakeA)||coincide(snakeA,snakeB)){
        return false;
        }
        return true;
        }
        private boolean outOfBounds(Snake snake22){
        if(snake22.get(0).getCol()>=COLS||snake22.get(0).getCol()<0
        ||snake22.get(0).getRow()>=ROWS||snake22.get(0).getRow()<0){
        return true;
        }
        return false;
        }
        private boolean coincide(Snake snakeA,Snake snakeB){
        for(int i=snakeA.size()-1;i>2;i--){
        if(snakeA.get(0).equals(snakeA.get(i))){
        /*
        * 重合
        */
        return true;
        }
        }
        for(int i=snakeB.size()-1;i>=0;i--){
        if(snakeA.get(0).equals(snakeB.get(i))){
        /*
        * 重合
        */
        return true;
        }
        }
        return false;
        }
        /**
        * 这个是游戏开始的方法
        */
        private void startGameAction() {
        snake1=Snake.start1();
        /*snake1.add(0,new Cell(20,3,Game.snakeHead));*/
        snake2=Snake.start2();
        food1=getFoods(snake1,snake2);
        /* System.out.println(food1);*/
        food2=getFoods(snake1,snake2,food1);
        SCORE=0;
        str="初级";
        }
        /**
        * 这个是生成food2的方法
        * @param snake1
        * @param snake2
        * @param food1
        * @return
        */
        private Food getFoods(Snake snake1, Snake snake2, Food food1) {
        Food food=null;
        boolean used=true;
        do{
        food=Food.getFood();
        if(food.getRow()!=food1.getRow()||food.getCol()!=food1.getCol()){
        used=false;
        }else{
        continue;
        }
        for(Cell cells:snake1){
        if(food.getRow()!=cells.getRow()||food.getCol()!=cells.getCol()){
        used=false;
        }else{
        used=true;
        }
        }
        if(used){
        continue;
        }
        for(Cell cells:snake2){
        if(food.getRow()!=cells.getRow()||food.getCol()!=cells.getCol()){
        used=false;
        }else{
        used=true;
        }
        }
        }while(used);
        return food;
        }
        /**
        * 这个是生成food1的方法
        * @param snake1
        * @param snake2
        * @return
        */
        private Food getFoods(Snake snake1,Snake snake2) {
        Food food=null;
        boolean used=true;
        do{
        food=Food.getFood();
        for(int i=snake1.size()-1;i>=0;i--){
        if(food.getRow()!=snake1.get(i).getRow()||food.getCol()!=snake1.get(i).getCol()){
        used=false;
        break;
        }
        }
        if(used){
        continue;
        }
        for(int i=snake2.size()-1;i>=0;i--){
        if(food.getRow()!=snake1.get(i).getRow()||food.getCol()!=snake1.get(i).getCol()){
        used=false;
        break;
        }else{
        used=true;
        }
        }
        }while(used);
        return food;
        }
        /**
        * 主方法，画出面板，让后把墙放在面板上，调用流程控制方法action
        * @param args
        */
        public static void main(String[] args){
        JFrame jframe=new JFrame();
        Game game=new Game();
        jframe.setSize(815,625);
        jframe.setTitle("双龙戏珠");
        jframe.add(game);
        jframe.setLocationRelativeTo(null);
        jframe.setVisible(true);
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        game.action();
        }
        }