Java 贪吃蛇

刚考完试，趁着现在还有空，弄了一下贪吃蛇的游戏。本来想弄个HTML版的，奈何不会JS，就弄了个Java的。整个程序由三个类（MainInterface、Snake、SNode）构成。

数据参数建议自己定义变量名，这样使用起来比较方便，也便于修改。如画板的宽度和高度，蛇与食物的大小。

完成效果长这样

MainInterface.java

	import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;


public class MainInterface extends JFrame implements KeyListener {
	Snake snake;
	static int rx;
    static int ry;
    static  int score = 0;
    boolean start = false;
	public MainInterface() {
		super("贪吃蛇");
		snake=new Snake();
		//食物出现的位置
		rx = ((int)(Math.random() * (500 - 20) + 60))/10*10;
	    ry = ((int)(Math.random() * (500 - 40) + 60))/10*10;	    
		this.setSize(600, 600);
        this.setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        addKeyListener(this);//添加监听        
        new Thread(new snackThread()).start();
	}
	
	public void paint(Graphics g)
    {				
        super.paint(g);   //没有会将面板刷掉        
        g.setColor(Color.black);
        g.fillRect(50, 50, 500, 500);  //刷新界面
        g.setColor(Color.white); 
        g.drawRect(50, 50, 500, 500);  //绘制边界
        g.setColor(Color.red);
        g.drawString("按方向键开始游戏",200,570);
        g.setColor(Color.red);
        g.drawString("Scores: " + score,440,570);  //食物数量
        g.setColor(Color.red);
        g.fillRect(rx, ry, 10, 10);   //食物
        g.setColor(Color.green);  //蛇头
        g.fillRect(snake.snacknode.get(0).getX(), snake.snacknode.get(0).getY(), 10, 10);
        g.setColor(Color.white);  //蛇身        
        for(int i = 1; i < snake.snacknode.size(); i++) {
            g.fillRect(snake.snacknode.get(i).getX(), snake.snacknode.get(i).getY(), 10, 10);
        }
    }
	
	@Override
	public void keyPressed(KeyEvent e) {
		// TODO Auto-generated method stub
		if(e.getKeyCode()==KeyEvent.VK_UP || e.getKeyCode()==KeyEvent.VK_DOWN || e.getKeyCode()==KeyEvent.VK_LEFT || e.getKeyCode()==KeyEvent.VK_RIGHT){
			start = true;
		}
		if(start){
			switch(e.getKeyCode()) {
				case KeyEvent.VK_UP:						
					snake.changeDirection("Up");
					break;
				case KeyEvent.VK_DOWN:						
					snake.changeDirection("Down");
					break;
				case KeyEvent.VK_LEFT:						
					snake.changeDirection("Left");
					break;
				case KeyEvent.VK_RIGHT:						
					snake.changeDirection("Right");
					break;
	        }
		}
		
	}

	@Override
	public void keyReleased(KeyEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void keyTyped(KeyEvent arg0) {
		// TODO Auto-generated method stub
		
	}
	@Override
	public void update(Graphics arg0) {
		// TODO Auto-generated method stub
		super.update(arg0);
	}
	
	class snackThread implements Runnable
    {
        public void run() {
            while(true) {
                try {
                    Thread.sleep(500);
                    repaint();
                    if(start) {
                        snake.Move();
                    }
                }
                catch(InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new MainInterface();
	}
}

Snake.java

	import java.util.ArrayList;

import javax.swing.JOptionPane;

public class Snake {
	ArrayList<SNode> snacknode = new ArrayList<>(); // 蛇的集合
	private String direction; //蛇头移动方向
	private int length = 0; //蛇的长度
	private int headx;  //蛇头X轴坐标
	private int heady;	////蛇头Y轴坐标

	/*
	 * 初始化蛇
	 * */
	public Snake() {
		direction = "Left";		
		snacknode.add(new SNode(300,350));
		snacknode.add(new SNode(310,350));
		snacknode.add(new SNode(320,350));
		length = snacknode.size();
	}
	
	public String getDirection() {
		return direction;
	}
	
	public void setDirection(String direction) {
		this.direction = direction;
	}
	
	public int getLenght() {
		return length;
	}
	
	public void setLength(int length) {
		this.length = length;
	}
	
	boolean Dead(){
		for(int i = 1; i < snacknode.size(); i++) {
			//撞到自己
            if(snacknode.get(0).getX() == snacknode.get(i).getX() && snacknode.get(0).getY() == snacknode.get(i).getY()) 
                return true;
        }
		//撞到墙
		if(snacknode.get(0).getX() < 60 || snacknode.get(0).getX() > 530  || snacknode.get(0).getY() < 60 || snacknode.get(0).getY() > 520) {
            return true;
        }
        return false;
	}
	//蛇移动
	public void Move() {		
		headx = snacknode.get(0).getX();
		heady = snacknode.get(0).getY();
		switch (direction) {
			case "Up":
				heady = heady - 10;
				break;
			case "Down":
				heady = heady + 10;
				break;
			case "Left":
				headx = headx - 10;
				break;
			case "Right":
				headx = headx + 10;
				break;
			default:
				break;
		}
        SNode newNode = new SNode();
        boolean eat = false;
        //吃掉食物
        if(Math.abs(headx - MainInterface.rx) < 10 && Math.abs(heady - MainInterface.ry) < 10) {
            eat = true;
            newNode = new SNode(snacknode.get(snacknode.size() - 1).getX(),snacknode.get(snacknode.size() - 1).getY());
            MainInterface.rx = ((int)(Math.random() * (500 - 20) + 60))/10*10;
            MainInterface.ry = ((int)(Math.random() * (500 - 40) + 60))/10*10;
        }
        for(int i = snacknode.size() - 1; i > 0; i--){
        	snacknode.set(i, snacknode.get(i - 1));
        }            
        snacknode.set(0,new SNode(headx,heady));  //将食物添加到蛇身
        if(Dead()) {
            JOptionPane.showMessageDialog(null, "Snake Dead!", "Message", JOptionPane.ERROR_MESSAGE);
            System.exit(1);
        }
        if(eat) {
            snacknode.add(newNode);
            MainInterface.score++;
        }
	}	
	public void changeDirection(String dir) {
		direction = dir;
	}
}

SNode.java

	/*
 	* 定义蛇身结点
 	* 
 	* */

public class SNode {
	private int x;
	private int y;
	public SNode() {}
	public SNode(int x ,int y){
		 this.x = x;
		 this.y = y;
	}
	
	public int getX() {
		return x;
	}
	
	public void setX(int x) {
		this.x=x;
	}
	
	public int getY() {
		return y;
	}
	
	public void setY(int y) {
		this.y=y;
	}
}