java实现简单贪吃蛇

Snake类：

import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
//框架类
public class Snake {
	public static void main(String[] args) {
		SnakeMenu frame = new SnakeMenu("贪吃蛇");// 创建一个带有菜单的游戏界面框架
		frame.setBounds(500, 150, 900, 720); 
		frame.setResizable(false); 
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		SnakePanel panel = new SnakePanel(); // 添加画布
		frame.add(panel);
		frame.setVisible(true); // 允许显示游戏界面
	}
}

SnakeMenu类：

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//菜单类
public class SnakeMenu extends JFrame {
	JMenuBar menubar;
	JMenu menu, subMenu;
	JMenuItem item1, item2;
	SnakePanel snake=new SnakePanel();
	public SnakeMenu(String s) {
		init(s);
	}
	//初始化菜单栏
	public void init(String s) {
		setTitle(s);
		menubar = new JMenuBar();
		menu = new JMenu("选项");
		subMenu = new JMenu("模式选择");
		menu.add(subMenu);
		//点击不同的模式时传入不同参数
		item1 = subMenu.add(new JMenuItem("撞墙死"));
		item1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent t) {
				snake.changePattern(true);
			}
			
		});
		item2 = subMenu.add(new JMenuItem("撞墙不死"));
		item2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent t) {
				snake.changePattern(false);
			}
		});
		menubar.add(menu);
		setJMenuBar(menubar);
	}
}

SnakePanel

package java_dazuoye;

import java.awt.BasicStroke;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.Timer;
//主功能类
public class SnakePanel extends JPanel implements KeyListener, ActionListener {
	ImageIcon up = new ImageIcon("up.jpg");// 蛇头
	ImageIcon food = new ImageIcon("food.png"); // 食物
	ImageIcon body = new ImageIcon("body.png");// 蛇身
	ImageIcon title = new ImageIcon("title.jpg"); // 主题图片
	ImageIcon backgrond = new ImageIcon("timg.jpg");// 背景图片

	int[] snakex = new int[850];// 储存蛇身的数组
	int[] snakey = new int[850];

	Random rand = new Random();// 随机生成食物
	int foodx = rand.nextInt(33) * 25 + 25;
	int foody = rand.nextInt(23) * 25 + 75;

	int len;// 长度
	int score;// 分数
	int maxScore = 0;// 最大分数
	int maxLenth = 3;// 最长长度
	String direction = "R"; // 方向：U上 D下 L左 R右
	boolean isStarted = false; // 判断游戏是否开始
	boolean isFailed = false; // 判断游戏是否结束
	static boolean meetWalldie = true;// 判断是否撞墙死,初始撞墙死
	int isFoodAtBody = 0; // 判断食物是否在蛇身上
	// int BodySum = 0;
	Timer timer = new Timer(100, this);// 每100毫秒调用一次ActionPerformed

	public void paint(Graphics g) {
		backgrond.paintIcon(this, g, 0, 0);// 放置背景
		title.paintIcon(this, g, 26, 11);// 放置主题图片
		// 绘制游戏边框
		Graphics2D g2 = (Graphics2D) g;
		g2.setStroke(new BasicStroke(5.0f));
		g2.setColor(Color.PINK);
		g2.drawRect(25, 75, 853, 582);
		// 绘制主题边框
		Graphics2D g3 = (Graphics2D) g;
		g3.setStroke(new BasicStroke(4.0f));
		g3.setColor(Color.BLACK);
		g3.drawRect(24, 12, 854, 55);
		up.paintIcon(this, g, snakex[0], snakey[0]);// 画蛇头
		for (int i = 1; i < len; i++)// 画蛇的身体
			body.paintIcon(this, g, snakex[i], snakey[i]);
		// 判断如果游戏没开始显示
		if (!isStarted) {
			g.setColor(Color.WHITE);
			g.setFont(new Font("华文琥珀", Font.BOLD, 30));
			g.drawString("按空格开始/暂停", 350, 350);
		}
		// 判断如果游戏结束显示
		if (isFailed) {
			g.setColor(Color.WHITE);
			g.setFont(new Font("华文琥珀", Font.BOLD, 30));
			g.drawString("不服？按空格再来一次！", 300, 350);
		}
		// 显示食物
		food.paintIcon(this, g, foodx, foody);
		// 显示分数等数值
		g.setColor(Color.ORANGE);
		g.setFont(new Font("华文彩云", Font.BOLD, 20));
		g.drawString("分数 : " + score, 650, 37);
		g.drawString("长度 : " + len, 650, 57);
		g.drawString("最高分 : " + maxScore, 750, 37);
		g.drawString("最长长度 : " + maxLenth, 750, 57);
	}

	// 游戏初始化
	public void setup() {
		isStarted = false;
		isFailed = false;
		len = 3;
		score = 0;
		direction = "R";
		snakex[0] = 100;
		snakex[1] = 75;
		snakex[2] = 50;
		snakey[0] = 100;
		snakey[1] = 100;
		snakey[2] = 100;
	}

	// 建造画布的构造方法
	public SnakePanel() {
		this.setFocusable(true); // 获取焦点
		this.addKeyListener(this); // 监听键盘事件
		setup();
		timer.start();
	}

	// 实现键盘响应
	public void keyPressed(KeyEvent e) {
		int KeyCode = e.getKeyCode();
		if (KeyCode == KeyEvent.VK_SPACE) { // 敲击空格显示/消除提示信息
			if (isFailed) {// 结束后经判断得到最大值
				if (score > maxScore) {
					maxScore = score;
					maxLenth = maxScore + 3;
				}
				setup();
			} else {
				isStarted = !isStarted;
			}
		} else if (KeyCode == KeyEvent.VK_UP && direction != "D" && isStarted)
			direction = "U";
		else if (KeyCode == KeyEvent.VK_DOWN && direction != "U" && isStarted)
			direction = "D";
		else if (KeyCode == KeyEvent.VK_RIGHT && direction != "L" && isStarted)
			direction = "R";
		else if (KeyCode == KeyEvent.VK_LEFT && direction != "R" && isStarted)
			direction = "L";
	}

	// 移动数据
	public void actionPerformed(ActionEvent e) {

		if (isStarted && !isFailed) {
			// 移动身体
			for (int i = len; i > 0; i--) {
				snakex[i] = snakex[i - 1];
				snakey[i] = snakey[i - 1];
			}
			// 移动头
			if (direction.equals("R")) {
				snakex[0] = snakex[0] + 25;
			} else if (direction.equals("L")) {
				snakex[0] = snakex[0] - 25;
			} else if (direction.equals("U")) {
				snakey[0] = snakey[0] - 25;
			} else if (direction.equals("D")) {
				snakey[0] = snakey[0] + 25;
			}
			if (meetWalldie) {// 判断模式
				if (snakex[0] > 850 || snakex[0] < 25 || (snakey[0] < 75) || snakey[0] > 625) {
					isFailed = true;
				}
			} else if (!meetWalldie) {
				if (snakex[0] > 850)
					snakex[0] = 25;
				if (snakex[0] < 25)
					snakex[0] = 850;
				if (snakey[0] < 75)
					snakey[0] = 625;
				if (snakey[0] > 625)
					snakey[0] = 75;
			}
			if (snakex[0] == foodx && snakey[0] == foody) { // 吃食物
				len++;
				score++;
				foodx = rand.nextInt(34) * 25 + 25;
				foody = rand.nextInt(23) * 25 + 75;
				for (int i = 1; i < len; i++) { // 如果食物在蛇身上则重新产生
					if (foodx == snakex[i] && foody == snakey[i]) {
						foodx = rand.nextInt(34) * 25 + 25;
						foody = rand.nextInt(23) * 25 + 75;
						break;
					}
				}
				// 不知道什么原因不能运行的循环，目的是使食物永远不会出现在蛇身上
				// while (isFoodAtBody == 1) {
				// foodx = rand.nextInt(34) * 25 + 25;
				// foody = rand.nextInt(23) * 25 + 75;
				// for (int i = 1; i < len; i++) { // 如果蛇头碰到自己的身体游戏结束
				// if (foodx != snakex[i] && foody != snakey[i])
				// BodySum++;
				// }
				// if (BodySum == len - 1) {
				// isFoodAtBody = 0;
				// break;
				// }
				// }
			}
			// 如果蛇头碰到自己的身体游戏结束
			for (int i = 1; i < len; i++) { 
				if (snakex[0] == snakex[i] && snakey[0] == snakey[i]) {
					isFailed = true;
				}
			}
		}
		repaint();
	}

	void changePattern(boolean meetWalldie) {
		this.meetWalldie = meetWalldie;
	}
	
	public void keyTyped(KeyEvent e) {

	}
	public void keyReleased(KeyEvent e) {

	}
}

图像文件：

body.png： ，food.png：  ，up.png：  

title.jpg ：

运行：
 

选项中有撞墙死和撞墙不死两种模式