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     @Override
108     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     @Override
130     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     @Override
180     public void keyReleased(KeyEvent e) {
181         
182     }
183 }