Java+swing实现经典贪吃蛇游戏

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public class StartGame {
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    public static void main(String[] args) {
        JFrame jf=new JFrame("贪吃蛇大作战");
        jf.setBounds(100, 100, 905, 720);
        jf.setResizable(false);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        jf.add(new GamePanel());
        jf.setVisible(true);
    }
​
}

public class GamePanel extends JPanel implements KeyListener,ActionListener{
	//蛇的数据结构
	static int i=0;
	int length;
	int[] snakex=new int[600];
	int[] snakey=new int[600];
	String fx;
	boolean isStart=false;
	boolean isfail=false;
	int lx,ly;//吃食物后多出来一个的坐标
	//目标的数据结构
	int foodx,foody;
	//随机数
	Random random =new Random();
	//计时器
	Timer timer=new Timer(100, this);
	
	int score;
	
	public GamePanel(){
		init();
		//添加键盘监听器
		this.addKeyListener(this);
		//必须设置可以获得焦点才能监听到键盘事件
		this.setFocusable(true);
		timer.start();
	}
	public void init(){
		score=0;
		length=3;
		snakex[0]=100;snakey[0]=100;
		snakex[1]=75;snakey[1]=100;
		snakex[2]=50;snakey[2]=100;
		fx="R";
		foodx=25+25*random.nextInt(850/25);
		foody=75+25*random.nextInt(600/25);
	}

	protected void paintComponent(Graphics g) {
		super.paintComponent(g);//清屏,这样不会闪烁
		this.setBackground(Color.white);
		Data.headicno.paintIcon(this, g, 25, 11);
		g.setColor(new Color(104,197,107));
		g.fillRect(25, 75, 850, 600);
		//蛇头的绘制
		if(fx.equals("U")){
			Data.upicno.paintIcon(this, g, snakex[0], snakey[0]);
		}else if(fx.equals("D")){
			Data.downicno.paintIcon(this, g, snakex[0], snakey[0]);
		}else if(fx.equals("L")){
			Data.lefticno.paintIcon(this, g, snakex[0], snakey[0]);
		}else if(fx.equals("R")){
			Data.righticno.paintIcon(this, g, snakex[0], snakey[0]);
		}
		//蛇身体绘制
		for(int i=1;i<length;++i){
			Data.bodyicno.paintIcon(this, g, snakex[i], snakey[i]);
		}
		//食物的绘制
		Data.foodicon.paintIcon(this, g, foodx, foody);
		//暂停开始状态的绘制
		if(isStart==false){
			g.setFont(new Font("微软雅黑",Font.BOLD,40));
			g.setColor(Color.WHITE);
			g.drawString("按空格开始/暂停游戏", 275, 350);
		}
		//失败情况的绘制
		if(isfail==true){
			g.setFont(new Font("微软雅黑",Font.BOLD,40));
			g.setColor(Color.red);
			g.drawString("失败!按空格重新开始", 275, 350);
		}
		//积分的绘制
		g.setColor(Color.PINK);
		g.setFont(new Font("微软雅黑", Font.ITALIC, 15));
		g.drawString("长度: "+length, 800, 30);
		g.drawString("积分: "+score, 800, 55);
	}
	//实现键盘监听的接口方法
	@Override
	public void keyPressed(KeyEvent e) {
		int keycode=e.getKeyCode();
		//空格键暂停或者重开
		if(keycode==KeyEvent.VK_SPACE){
			if(isfail==true){
				System.out.println(1);
				init();
				isfail=false;
			}
			else{
				System.out.println(2);
				isStart=!isStart;
				repaint();
			}
		}
		//上下左右
		if(keycode==KeyEvent.VK_UP){
			fx="U";
		}else if(keycode==KeyEvent.VK_DOWN){
			fx="D";
			//System.out.println("down");
		}else if(keycode==KeyEvent.VK_LEFT){
			fx="L";
		}else if(keycode==KeyEvent.VK_RIGHT){
			fx="R";
		}
	}
	@Override
	public void keyReleased(KeyEvent e) {}
	@Override
	public void keyTyped(KeyEvent e){}

	@Override
	public void actionPerformed(ActionEvent e) {
		if(isStart==true&&isfail==false){
			
			//身体移动
			lx=snakex[length-1];
			ly=snakey[length-1];
			for(int i=length-1;i>0;--i){
				snakex[i]=snakex[i-1];
				snakey[i]=snakey[i-1];
			}
			//头移动
			if(fx=="U"){
				snakey[0]-=25;
				if(snakey[0]<75)snakey[0]=650;
			}else if(fx=="D"){
				snakey[0]+=25;
				if(snakey[0]>650)snakey[0]=75;
			}else if(fx=="L"){
				snakex[0]-=25;
				if(snakex[0]<25)snakex[0]=850;
			}else if(fx=="R"){
				snakex[0]+=25;
				if(snakex[0]>850)snakex[0]=25;
			}
			//失败判定
			for(int i=1;i<length;++i){
				if(snakex[i]==snakex[0]&&snakey[i]==snakey[0]){
					isfail=true;
				}
			}
			//吃食物
			if(snakex[0]==foodx&&snakey[0]==foody){
				length++;
				score+=10;
				snakex[length-1]=lx;
				snakey[length-1]=ly;
				foodx=25+25*random.nextInt(850/25);
				foody=75+25*random.nextInt(600/25);
			}
			repaint();
		}
		
	}
	
}