贪吃蛇游戏的设计步骤：

 1 package snake; 2  3 import javax.swing.JFrame; 4 import javax.swing.JPanel; 5  6 public class Snake { 7  8     public static void main(String[] args) { 9         10         JFrame frame = new JFrame(); // 创建一个游戏界面的框架11         frame.setBounds(10, 10, 900, 720); // 设置框架的大小12         frame.setResizable(false); // 设置框架大小为不能改变13         // 点击关闭按钮 关闭游戏界面14         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);15         16         SnakePanel panel = new SnakePanel();  //添加画布17         frame.add(panel); // 刚添加时画布是空的看不到18         19         frame.setVisible(true); // 允许显示游戏界面20     }21 22 }

  1 package snake;  2   3 import java.awt.Color;  4 import java.awt.Font;  5 import java.awt.Graphics;  6 import java.awt.event.ActionEvent;  7 import java.awt.event.ActionListener;  8 import java.awt.event.KeyEvent;  9 import java.awt.event.KeyListener; 10 import java.util.Random; 11  12 import javax.swing.ImageIcon; 13 import javax.swing.JPanel; 14 import javax.swing.Timer; 15  16 public class SnakePanel extends JPanel implements KeyListener,ActionListener{ 17  18     // 定义七个图片变量，代表七张图片 19     ImageIcon up = new ImageIcon("up.png"); // 向上的蛇头 20     ImageIcon down = new ImageIcon("down.png"); // 向下的蛇头 21     ImageIcon left = new ImageIcon("left.png"); // 向左的蛇头 22     ImageIcon right = new ImageIcon("right.png"); // 向右的蛇头 23     ImageIcon food = new ImageIcon("food.png");  // 食物 24     ImageIcon body = new ImageIcon("body.png");  // 蛇的身体 25     ImageIcon title = new ImageIcon("title.jpg"); // 游戏界面的主题 26      27     // 蛇的每一部分 28     int[] snakex = new int [750]; 29     int[] snakey = new int [750]; 30      31     // 随机生成食物 32     Random rand = new Random(); 33     int foodx = rand.nextInt(34)*25+25; //此处的数值根据自己设计的游戏界面的大小来确定 34     int foody = rand.nextInt(24)*25+75; 35      36     // 设置游戏的默认属性 37     int len = 3; 38     int score = 0; 39     String direction = "R"; // U上 D下 L左 R右 40      41     boolean isStarted = false; // 判断游戏是否开始 42     boolean isFailed = false; // 判断游戏是否结束 43      44     Timer timer = new Timer(100,this); // 每100毫秒调用一次ActionPerformed 45      46      47     public SnakePanel() { // 建造画布的构造函数 48         this.setFocusable(true);  // 获取焦点 49         this.addKeyListener(this); // 监听键盘事件 50         setup(); 51         timer.start(); 52     } 53      54     public void paint(Graphics g) { // Graphics 画笔 55          56         this.setBackground(Color.BLACK); // 设置画布背景颜色 57         title.paintIcon(this, g, 25, 11);// 放置主题图片 58         g.fillRect(25, 75, 850, 650); // 用画笔设置游戏方框 59          60         // 画蛇头（注意判断蛇头的方向） 61         if (direction.equals("R"))  62             right.paintIcon(this, g, snakex[0], snakey[0]); 63         else if (direction.equals("L"))  64             left.paintIcon(this, g, snakex[0], snakey[0]); 65         else if (direction.equals("U"))  66             up.paintIcon(this, g, snakex[0], snakey[0]); 67         else if (direction.equals("D"))  68             down.paintIcon(this, g, snakex[0], snakey[0]); 69          70         // 画蛇的身体 71         for(int i = 1; i < len; i ++) 72             body.paintIcon(this, g, snakex[i], snakey[i]); 73          74         // 判断如果游戏没开始显示。。。 75         if (!isStarted){  76             g.setColor(Color.WHITE); 77             g.setFont(new Font("arial",Font.BOLD, 30)); 78             g.drawString("Press Space to start / pause", 200, 300); 79         } 80          81         // 判断如果游戏结束显示。。。 82         if (isFailed){ 83             g.setColor(Color.WHITE);  84             g.setFont(new Font("arial",Font.BOLD, 30)); 85             g.drawString("Game Over ! Press space to restart", 200, 300); 86         } 87          88         // 显示食物 89         food.paintIcon(this, g, foodx, foody); 90          91         // 设置分数和蛇的长度 92         g.setColor(Color.WHITE); 93         g.setFont(new Font("arial",Font.PLAIN,15)); 94         g.drawString("Score : "+score, 650, 37); 95         g.drawString("Len :"+len, 650, 57); 96     } 97      98     public void setup() { // 游戏初始化 99         isStarted = false;100         isFailed = false;101         len = 3;102         score = 0;103         snakex[0] = 100; snakex[1] = 75; snakex[2] = 50;104         snakey[0] = 100; snakey[1] = 100; snakey[2] = 100;105     }106 107     @Override108     public void keyPressed(KeyEvent e) {109         110         //实现键盘响应 111         int KeyCode = e.getKeyCode();112         if (KeyCode == KeyEvent.VK_SPACE){ // 敲击空格现实/消除提示信息113             if (isFailed){114 //                isStarted = false;  // 可以将这两行放入setup中115 //                isFailed = false;116                 setup();117             }else 118                 isStarted = !isStarted;119         } else if (KeyCode ==  KeyEvent.VK_UP && direction != "D")120                 direction = "U";121           else if (KeyCode ==  KeyEvent.VK_DOWN && direction != "U" )122                 direction = "D";123           else if (KeyCode ==  KeyEvent.VK_RIGHT && direction != "L")124                 direction = "R";125           else if (KeyCode ==  KeyEvent.VK_LEFT && direction != "R")126                 direction = "L";127     }128 129     @Override130     public void actionPerformed(ActionEvent e) {131         // 1. 再定义一个闹钟132         timer.start();133                 134         // 2. 移动数据135         if (isStarted && !isFailed){136             // 移动身体137         for (int i = len; i>0; i--){138             snakex[i] = snakex[i-1];139             snakey[i] = snakey[i-1];140         }141         // 移动头142         if (direction.equals("R")){143             snakex[0] = snakex[0] + 25;144             if(snakex[0] > 850) snakex[0] = 25;145             }else if (direction.equals("L")){146                 snakex[0] = snakex[0] - 25;147                 if(snakex[0] < 25) snakex[0] = 850;148             }else if (direction.equals("U")){149                 snakey[0] = snakey[0] - 25;150                 if (snakey[0] < 75) snakey[0] = 650;151             }else if (direction.equals("D")){152                 snakey[0] = snakey[0] + 25;153                 if (snakey[0] > 650) snakey[0] = 75;154             }155                     156             if (snakex[0] == foodx && snakey[0] == foody){  // 吃食物157                     len ++;158                     score ++;159                     foodx = rand.nextInt(34)*25+25;160                     foody = rand.nextInt(24)*25+75;161             }162                     163             for (int i = 1; i < len; i ++){  // 如果蛇头碰到自己的身体游戏结束164                 if (snakex[0] == snakex[i] && snakey[0] == snakey[i]){165                     isFailed = true;166                 }167             }168                     169         }170         // 3. repaint（）171             repaint();172     }173     174     @Override 175     public void keyTyped(KeyEvent e) {176         177     }178 179     @Override180     public void keyReleased(KeyEvent e) {181         182     }183 }