Java实现贪吃蛇小游戏

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 Snake extends JPanel implements KeyListener,ActionListener { //导入图片 ImageIcon title = new ImageIcon("title.jpg"); ImageIcon body = new ImageIcon("body.png"); ImageIcon uphead = new ImageIcon("up.png"); ImageIcon downhead = new ImageIcon("down.png"); ImageIcon lefthead = new ImageIcon("left.png"); ImageIcon righthead = new ImageIcon("right.png"); ImageIcon food = new ImageIcon("food.png"); //定义初始分数 int score = 0; //定义蛇长度和坐标位置 int len; int [] snakex = new int[750]; int [] snakey = new int [750]; String way = "R"; //定义方向：U向上、D向下、L向左、R向右 boolean isStarted = false; //定义开始键盘 boolean isFalse = false; //定义游戏开始结束 Timer time = new Timer(200,this); //定义时钟 int foodx; int foody; Random random = new Random(); //生成随机数 public Snake(){ initSnake(); this.setFocusable(true); //获取焦点：获取键盘监听事件 this.addKeyListener(this); //自身进行监听 time.start(); } public void paintComponent(Graphics g){ super.paintComponent(g); this.setBackground(Color.WHITE); //设置画板大小位置 title.paintIcon(this,g,25,11); g.fillRect(25,75,850,600); //分数显示位置 g.setColor(Color.white); g.setFont(new Font("arial",Font.BOLD,20)); g.drawString("score: "+score,700,50); //初始化蛇位置 food.paintIcon(this,g,foodx,foody); //判断蛇头方向变化 if(way == "U"){ uphead.paintIcon(this,g,snakex[0],snakey[0]); }else if (way == "D") { downhead.paintIcon(this,g,snakex[0],snakey[0]); }else if (way == "L") { lefthead.paintIcon(this,g,snakex[0],snakey[0]); }else if (way == "R") { righthead.paintIcon(this,g,snakex[0],snakey[0]); } //游戏中蛇长度变化 for(int i=0;i<len;i++){ body.paintIcon(this,g,snakex[i],snakey[i]); } //设置开始标志 if(isStarted == false){ g.setColor(Color.white); g.setFont(new Font("arial",Font.BOLD,40)); g.drawString("Pleas Space TO Start",280,300); } //设置结束标志 if(isFalse == true){ g.setColor(Color.RED); g.setFont(new Font("arial",Font.BOLD,40)); g.drawString("Game Over !!!",280,300); } //吃食物：判断食物的坐标与蛇头的坐标是否相等 if(snakex[0]==foodx&&snakey[0]==foody){ len++; //蛇身体长度+1 score++; //分数+1 //再次随机生成食物坐标 foodx = 25 +25*random.nextInt(34); foody = 75 +25*random.nextInt(24); } } //初始化蛇的类 public void initSnake(){ //初始化蛇长度 len = 3; //初始化蛇头坐标 snakex[0]=100; snakey[0]=100; //初始化蛇身坐标 snakex[1]=75; snakey[1]=100; snakex[2]=50; snakey[2]=100; //初始化食物坐标 foodx = 25 +25*random.nextInt(34); foody = 75 +25*random.nextInt(24); //初始化蛇方向：向右 way = "R"; //重置分数 score = 0; } @Override //键盘敲了 public void keyTyped(KeyEvent e) { } @Override //键敲到底了 public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode(); //获取键盘按键位置 if(keyCode == KeyEvent.VK_SPACE){ //如果按键=空格键 //如果失败则重新初始化 if(isFalse){ isFalse = false; initSnake(); } else { isStarted = !isStarted; } repaint(); //重写 } //键盘控制蛇方向 if(keyCode == KeyEvent.VK_UP){ way="U"; } else if (keyCode == KeyEvent.VK_DOWN) { way="D"; } else if (keyCode == KeyEvent.VK_LEFT) { way="L"; } else if (keyCode == KeyEvent.VK_RIGHT) { way="R"; } } @Override //键起来了 public void keyReleased(KeyEvent e) { } @Override public void actionPerformed(ActionEvent e) { //按空格键开始游戏 if(isStarted && !isFalse){ //蛇身体往前移动 for(int i =len-1;i>0;i--){ snakex[i]=snakex[i-1]; snakey[i]=snakey[i-1]; } //键盘控制蛇穿墙 if(way=="U"){ //蛇头往上移 snakey[0]=snakey[0]-25; //穿墙行为：当蛇到达上边界后则从上边界穿回来 if(snakey[0]==50){ snakey[0]=650; } } else if (way=="D") { //蛇头往下移 snakey[0]=snakey[0]+25; //穿墙行为：当蛇到达下边界后则从上边界穿回来 if(snakey[0]==675){ snakey[0]=75; } } else if (way=="L") { //蛇头往左移 snakex[0]=snakex[0]-25; //穿墙行为：当蛇到达左边界后则从右边界穿回来 if(snakex[0]==0){ snakex[0]=850; } } else if (way=="R") { //蛇头往右移 snakex[0]=snakex[0]+25; //穿墙行为：当蛇到达右边界后则从左边界穿回来 if(snakex[0]==875){ snakex[0]=25; } } //判断游戏失败：蛇头与蛇身坐标相等 for (int i = 1; i < len; i++) { if (snakex[0] == snakex[i] && snakey[0] == snakey[i]) { isFalse = true; } } repaint(); //重画 } time.start(); } }