用java开发贪吃蛇游戏

跟着网易云课堂上轻课java公开课上学习的开发贪吃蛇游戏，比较简单。

开发环境为JDK和eclipse

实现的功能是蛇吃食物增加长度，游戏开始结束，键盘控制游戏开始暂停蛇的走向。

先附上效果图。

下面看代码：

父类

public class Snake {

	public static void main(String[] args) {
		
		//画出白色窗口
		JFrame frame=new JFrame();
		frame.setBounds(10, 10, 900, 720);
		frame.setResizable(false);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//画布加到窗户里面
		SnakePanel panel=new SnakePanel();
		frame.add(panel);
		//设置让其展现出来
		frame.setVisible(true);
	}

}

子类

package snake;

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;

public class SnakePanel extends JPanel implements KeyListener,ActionListener{
	ImageIcon up=new ImageIcon("up.png");
	ImageIcon down=new ImageIcon("down.png");
	ImageIcon right=new ImageIcon("right.png");
	ImageIcon left=new ImageIcon("left.png");
	ImageIcon title=new ImageIcon("title.jpg");
	ImageIcon food=new ImageIcon("food.png");
	ImageIcon body=new ImageIcon("body.png");


	int[] snakex=new int[750];
	int[] snakey=new int[750];
	//食物的坐标
	Random rand=new Random();
	int foodx=rand.nextInt(34)*25+25;
	int foody=rand.nextInt(24)*25+75;
	
	int len=3;
	int score=0;
	String fangxiang="R";
	
	boolean isStarted=false;
	//构造函数
	boolean isFailed=false;
	
	Timer timer=new Timer(100,this);
	public SnakePanel(){
		//设置可以获得焦点
		this.setFocusable(true);
		
		this.addKeyListener(this);
		//调用setup
		setup();
		//启动timer
		timer.start();
	}
//画笔 Graphics 
	public void paint(Graphics g){
		this.setBackground(Color.WHITE);
		title.paintIcon(this, g, 25, 11);
		g.fillRect(25, 75, 850, 600);
		
		//画出蛇头
		if(fangxiang.equals("R")){
			right.paintIcon(this, g, snakex[0], snakey[0]);
		}else if(fangxiang.equals("L")){
			left.paintIcon(this, g, snakex[0], snakey[0]);
		}else if(fangxiang.equals("U")){
			up.paintIcon(this, g, snakex[0], snakey[0]);
		}else if(fangxiang.equals("D")){
			down.paintIcon(this, g, snakex[0], snakey[0]);
		}
		
		//画出蛇的身体
		for(int i=1;i<len;i++){
			body.paintIcon(this, g, snakex[i], snakey[i]);
		}
		
		if(!isStarted){
			
			g.setColor(Color.WHITE);
			//设置字体
			g.setFont(new Font("arial",Font.BOLD,30));
			//画字符串
			g.drawString("Press Space to Start/Pause", 300, 300);
		}
		
		if(isFailed){
			g.setColor(Color.WHITE);
			//设置字体
			g.setFont(new Font("arial",Font.BOLD,30));
			//画字符串
			g.drawString("Game over，Press Space to Start/Pause", 300, 300);
		}
		food.paintIcon(this, g, foodx, foody);
		
		g.setColor(Color.WHITE);
		g.setFont(new Font("arial",Font.PLAIN,10));
		g.drawString("Score:"+score,800, 30);
		g.drawString("Length"+len, 800, 50);
	}
	public void setup(){
		isStarted=false;
		isFailed=false;
		len=3;
		snakex[0]=100;
		snakey[0]=100;
		snakex[1]=75;
		snakey[1]=100;
		snakex[2]=50;
		snakey[2]=100;
		
	}
	@Override
	public void keyPressed(KeyEvent e) {
		int keyCode=e.getKeyCode();
		if(keyCode==KeyEvent.VK_SPACE){
			if(isFailed){
				setup();
			}else{
				isStarted=!isStarted;
			}
		}else if(keyCode==KeyEvent.VK_UP&&fangxiang!="D"){
			fangxiang="U";
		}else if(keyCode==KeyEvent.VK_DOWN&&fangxiang!="U"){
			fangxiang="D";
		}else if(keyCode==KeyEvent.VK_RIGHT&&fangxiang!="L"){
			fangxiang="R";
		}else if(keyCode==KeyEvent.VK_LEFT&&fangxiang!="R"){
			fangxiang="L";
		}
		
		
		
	}
	@Override
	public void keyReleased(KeyEvent e) {
	}
	@Override
	public void keyTyped(KeyEvent e) {
			
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		//再定一个闹钟
		timer.start();
		//2.移动数据
		
		//移动身体
		if(isStarted&&!isFailed){
			for(int i=len;i>0;i--){
				snakex[i]=snakex[i-1];
				snakey[i]=snakey[i-1];
			}
	    //移动头
			if(fangxiang.equals("R")){
				snakex[0]=snakex[0]+25;
				if(snakex[0]>850) snakex[0]=25;
			}else if(fangxiang.equals("L")){
				snakex[0]=snakex[0]-25;
				if(snakex[0]<25)snakex[0]=850;
			}else if(fangxiang.equals("U")){
				snakey[0]=snakey[0]-25;
				if(snakey[0]<75) snakey[0]=650;
			}else if(fangxiang.equals("D")){
				snakey[0]=snakey[0]+25;
				if(snakey[0]>650) snakey[0]=75;
			}
			//吃食物
			if(snakex[0]==foodx&&snakey[0]==foody){
				len++;
				score++;
				foodx=rand.nextInt(34)*25+25;
				foody=rand.nextInt(24)*25+75;			
				
			}
			for(int i=1;i<len;i++){
				if(snakex[0]==snakex[i]&&snakey[0]==snakey[i]){
					isFailed=true;
				}
			}
			
		}
		
		//3.repaint()
		repaint();
	}
}