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以上是准备工作
Data
import javax.swing.*;
import java.net.URL;
public class Data {
    public static URL headerURL=Data.class.getResource("static/header.png");
    public static ImageIcon header =new ImageIcon(headerURL);
    public static URL upURL=Data.class.getResource("static/up.png");
    public static URL downURL=Data.class.getResource("static/down.png");
    public static URL leftURL=Data.class.getResource("static/left.png");
    public static URL rightURL=Data.class.getResource("static/right.png");
    public static ImageIcon up =new ImageIcon(upURL);
    public static ImageIcon down =new ImageIcon(downURL);
    public static ImageIcon left =new ImageIcon(leftURL);
    public static ImageIcon right =new ImageIcon(rightURL);
    public static URL bodyURL=Data.class.getResource("static/body.png");
    public static ImageIcon body =new ImageIcon(bodyURL);
    public static URL foodURL=Data.class.getResource("static/food.png");
    public static ImageIcon food =new ImageIcon(foodURL);
}
 
GamePanel
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;
public class GamePanel extends JPanel implements KeyListener , ActionListener {
        //定义蛇的数据结构
        int length;//蛇的长度
        // 蛇的x,y坐标
        int[]snakeX=new int[600];
        int[]snakeY=new int[500];
        String fx;
        //游戏当前的状态:开始,停止
        boolean isStart=false;//默认是不开始
        boolean isFail=false;//游戏结果的状态
    int score;
    int foody,foodx;
    Random  random=new Random();
    //定时器 ms为单位 1000ms=1s
    Timer timer=new Timer(100,this);
    //构造器
    public GamePanel(){
        init();
        //获得焦点和键盘事件
        this.setFocusable(true);
        this.addKeyListener(this);
        timer.start();//游戏qidong
    }
    public void init(){
        length=3;
        snakeX[0]=100;snakeY[0]=100;//脑袋坐标
        snakeX[1]=75;snakeY[1]=100;//第一个身体的坐标
        snakeX[2]=50;snakeY[2]=100;//第二个身体的坐标
        fx="R";//inti向右
        //随机分布food
        foodx=25+25*random.nextInt(34);
        foody=75+25*random.nextInt(24);
        score=0;
    }
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        //绘制静态的面板
        this.setBackground(Color.WHITE);
        Data.header.paintIcon(this,g,25,11);//画头部广告
        g.fillRect(25,75,850,600);//默认的游戏界面
        //画积分
        g.setColor(Color.WHITE);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("长度 "+length,750,30);
        g.drawString("积分 "+score,750,55);
        //画食物
        Data.food.paintIcon(this,g,foodx,foody);
        //把小蛇画上去
        if(fx.equals("R")){
            Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右
        }
        else if(fx.equals("L")){
            Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向L
        }
        else if(fx.equals("U")){
            Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向UP
        }
        else if(fx.equals("D")){
            Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向down
        }
        for(int i=1;i<length;i++){
            Data.body.paintIcon(this,g,snakeX[i],snakeY[i] );
        }
//游戏状态
        if(isStart==false){
            g.setColor(Color.white);
            g.setFont(new Font("微软雅黑",Font.BOLD,30));
            g.drawString("Pressed the Blank Key Begin Game",300,300);
        }
//游戏结束
        if(isFail){
            g.setColor(Color.RED);
            g.setFont(new Font("微软雅黑",Font.BOLD,30));
            g.drawString("The Game Is Failed",250,300);
        }
    }
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode=e.getKeyCode();//获得键盘参数
        //空格开始
        if(keyCode==KeyEvent.VK_SPACE){
            if(isFail){
                isFail=false;
            }else{
            isStart=!isStart;}
            repaint();
        }
        //小蛇移动
        if(keyCode==KeyEvent.VK_UP){
            fx="U";
        } else if (keyCode==KeyEvent.VK_DOWN) {
            fx="D";
        }else if (keyCode==KeyEvent.VK_LEFT) {
            fx="L";
        }else if (keyCode==KeyEvent.VK_RIGHT) {
            fx="R";
        }
        //走向
        if(fx.equals("R")){
            snakeX[0]=snakeX[0]+25;
            if(snakeX[0]>850){snakeX[0]=25;}//边界判断
        }else if(fx.equals("L")){
            snakeX[0]=snakeX[0]-25;
            if(snakeX[0]<25){snakeX[0]=850;}//边界判断
        }else if(fx.equals("U")){
            snakeY[0]=snakeY[0]-25;
            if(snakeY[0]<75){snakeY[0]=650;}//边界判断
        }else if(fx.equals("D")){
            snakeY[0]=snakeY[0]+25;
            if(snakeY[0]>650){snakeY[0]=75;}//边界判断
        }
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        if(isStart&&isFail==false){
            for (int i = length-1; i >0 ; i--) {
                snakeX[i]=snakeX[i-1];
                snakeY[i]=snakeY[i-1];
            }
            if(snakeX[0]==foodx&&snakeY[0]==foody){
                length++;
                score+=10;
//重置食物
                foodx=25+25*random.nextInt(34);
                foody=75+25*random.nextInt(24);
            }
            //头部走向
            if(fx.equals("R")){
                snakeX[0] = snakeX[0]+25;   //头部右移25个单位(即一格)
                if(snakeX[0]>850){  //边界判断:如果蛇右移到了边界,则回到左边
                    snakeX[0] = 25;
                }
            }else if(fx.equals("L")){
                snakeX[0] = snakeX[0]-25;           //头部左移25个单位(即一格)
                if(snakeX[0]<25){snakeX[0] = 850;}  //边界判断
            }else if(fx.equals("U")){
                snakeY[0] = snakeY[0]-25;           //向上移动应该是-25
                if(snakeY[0]<75){snakeY[0] = 650;}  //边界判断
            }else if(fx.equals("D")){
                snakeY[0] = snakeY[0]+25;           //向下移动
                if(snakeY[0]>650){snakeY[0] = 75;}  //边界判断
            }
            for (int i = 1; i < length; i++) {  //头部与身体的某一节坐标重合,即撞到自己
                if(snakeX[0] == snakeX[i] && snakeY[0]==snakeY[i]){
                    isFail=true;
                    init();
                }
            }
            repaint();
        }
        timer.start();
    }
    @Override
    public void keyReleased(KeyEvent e) {
    }
    @Override
    public void keyTyped(KeyEvent e) {
    }
}
 
StartGame
import javax.swing.*;
public class StartGame {
    public static void main(String[] args) {
        JFrame frame=new JFrame();
        frame.setBounds(10,10,900,720);
        //窗口设置大小固定
        frame.setResizable(false);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        //正常游戏界面都应该在面上
        frame.add(new GamePanel());
        frame.setVisible(true);
    }
}
 
                


















