@SuppressWarnings("serial")public class MainClass extends JFrame { ControlSnake control; Toolkit kit; Dimension dimen; public static void main(String[] args) {  new MainClass("my snake"); } public MainClass(String s) {  super(s);  control = new ControlSnake();  control.setFocusable(true);  kit = Toolkit.getDefaultToolkit();  dimen = kit.getScreenSize();  add(control);  setLayout(new BorderLayout());  setLocation(dimen.width / 3, dimen.height / 3);// dimen.width/3,dimen.height/3  setSize(FWIDTH, FHEIGHT);  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  setResizable(false);  setVisible(true); } public static final int FWIDTH = 315; public static final int FHEIGHT = 380;}import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.Timer;import java.util.Random;@SuppressWarnings("serial")public class ControlSnake extends JPanel implements ActionListener { Random rand; ArrayList
     
       list, listBody; String str, str1; static boolean key; int x, y, dx, dy, fx, fy, flag; int snakeBody; int speed; public ControlSnake() {  snakeBody = 1;  str = "上下左右方向键控制 P键暂停...";  str1 = "现在的长度为:" + snakeBody;  key = true;  flag = 1;  speed = 700;  rand = new Random();  list = new ArrayList
      
       ();  listBody = new ArrayList
       
        ();  x = 5;  y = 5;  list.add(new Point(x, y));  listBody.add(list.get(0));  dx = 10;  dy = 0;  fx = rand.nextInt(30) * 10 + 5;// 2  fy = rand.nextInt(30) * 10 + 5;// 2  setBackground(Color.WHITE);  setSize(new Dimension(318, 380));  final Timer time = new Timer(speed, this);  time.start();  addKeyListener(new KeyAdapter() {   public void keyPressed(KeyEvent e) {    if (e.getKeyCode() == 37) {     dx = -10;     dy = 0;    } else if (e.getKeyCode() == 38) {     dx = 0;     dy = -10;    } else if (e.getKeyCode() == 39) {     dx = 10;     dy = 0;    } else if (e.getKeyCode() == 40) {     dx = 0;     dy = 10;    } else if (e.getKeyCode() == 80) {     if (flag % 2 == 1) {      time.stop();     }     if (flag % 2 == 0) {      time.start();     }     flag++;    }   }  }); } public void paint(Graphics g) {  g.setColor(Color.WHITE);  g.fillRect(0, 0, 400, 400);  g.setColor(Color.DARK_GRAY);  g.drawLine(3, 3, 305, 3);  g.drawLine(3, 3, 3, 305);  g.drawLine(305, 3, 305, 305);  g.drawLine(3, 305, 305, 305);  g.setColor(Color.PINK);  for (int i = 0; i < listBody.size(); i++) {   g.fillRect(listBody.get(i).x, listBody.get(i).y, 9, 9);  }  g.fillRect(x, y, 9, 9);  g.setColor(Color.ORANGE);  g.fillRect(fx, fy, 9, 9);  g.setColor(Color.DARK_GRAY);  str1 = "现在的长度为:" + snakeBody;  g.drawString(str, 10, 320);  g.drawString(str1, 10, 335); } public void actionPerformed(ActionEvent e) {  x += dx;  y += dy;  if (makeOut() == false) {   JOptionPane.showMessageDialog(null, "重新开始......");   speed = 700;   snakeBody = 1;   x = 5;   y = 5;   list.clear();   list.add(new Point(x, y));   listBody.clear();   listBody.add(list.get(0));   dx = 10;   dy = 0;  }  addPoint(x, y);  if (x == fx && y == fy) {   speed = (int) (speed * 0.8);//速度增加参数   if (speed < 200) {    speed = 100;   }   fx = rand.nextInt(30) * 10 + 5;// 2   fy = rand.nextInt(30) * 10 + 5;// 2   snakeBody++;// 2  } // 2  repaint(); } public void addPoint(int xx, int yy) {  // 动态的记录最新发生的50步以内的移动过的坐标  // 并画出最新的snakeBody  if (list.size() < 100) {
   //蛇身长度最长为100   list.add(new Point(xx, yy));  } else {   list.remove(0);   list.add(new Point(xx, yy));  }  if (snakeBody == 1) {   listBody.remove(0);   listBody.add(0, list.get(list.size() - 1));  } else {   listBody.clear();   if (list.size() < snakeBody) {    for (int i = list.size() - 1; i > 0; i--) {     listBody.add(list.get(i));    }   } else {    for (int i = list.size() - 1; listBody.size() < snakeBody; i--) {     listBody.add(list.get(i));    }   }  } } public boolean makeOut() {  if ((x < 3 || y < 3) || (x > 305 || y > 305)) {   return false;  }  for (int i = 0; i < listBody.size() - 1; i++) {   for (int j = i + 1; j < listBody.size(); j++) {    if (listBody.get(i).equals(listBody.get(j))) {     return false;    }   }  }  return true; }}