java swing 小游戏 贪吃蛇详解编程语言

GreedySnake.java         

package com.fred.test; 
import java.awt.event.KeyListener; 
import java.awt.event.KeyEvent; 
import java.awt.Graphics; 
import java.awt.Point; 
import java.awt.Color; 
import java.util.Random; 
import java.util.List; 
import java.util.LinkedList; 
import javax.swing.JPanel; 
import javax.swing.JFrame; 
 
class Food{ 
	Snake snake; 
	int x,y; 
	boolean flag; 
	Food(Snake snake){ 
		this.snake = snake; 
		flag = true; 
		int x = 0; 
		int y = 0; 
		while(flag){ 
			flag = false; 
			x = Math.abs(new Random().nextInt()%40); 
			y = Math.abs(new Random().nextInt()%40); 
			if(snake.head.x==x && snake.head.y==y) flag = true; 
			for(Point it:snake.body) if(it.x==x && it.y==y) flag = true; 
		} 
		this.x = x; 
		this.y = y; 
	} 
	 
} 
class Snake{ 
	int size,length,dir; 
	List<Point> body; 
	Point head; 
	Snake(Point head){ 
		size = 10; 
		length = 5;dir = 4; 
		this.head = head; 
		body = new LinkedList<Point>(); 
		for(int i=0;i<length-1;i++){ 
			Point p = new Point(head.x,head.y+1+i); 
			body.add(p); 
		} 
	} 
	boolean isEat(Food food){ 
		if(head.x==food.x && head.y==food.y) return true; 
		return false; 
	} 
	boolean isOut(){ 
		if(head.x<0 || head.y<0 || head.x>=40 || head.y>=40) 
			return true; 
		return false; 
	} 
	boolean isPitch(){ 
		for(Point it:body) 
			if(head.x==it.x && head.y==it.y){ 
				dead(1); 
				return true; 
			} 
		return false; 
	} 
	void dead(int way){ 
		System.exit(way); 
	} 
} 
class MyPanel extends JPanel implements KeyListener,Runnable{ 
	Snake snake; 
	Food food; 
	int speed; 
	MyPanel(Snake snake,Food food){ 
		this.snake = snake; 
		this.food = food; 
		speed = 526; 
	} 
	public void paint(Graphics g){ 
		super.paint(g); 
		g.fillRect(0,0,400,400); 
		g.setColor(Color.YELLOW); 
		g.fillRect(snake.head.x*snake.size,snake.head.y*snake.size,snake.size,snake.size); 
		g.setColor(Color.ORANGE); 
		for(Point it:snake.body) g.fillRect(it.x*snake.size,it.y*snake.size,snake.size,snake.size); 
		g.setColor(Color.GREEN); 
		g.fillRect(food.x*snake.size,food.y*snake.size,snake.size,snake.size); 
	} 
	//自动行进 
	public void keyPressed(Integer dir){ 
		 
		Point oxy = new Point(snake.head); 
			if(dir==3){ 
				snake.head.x--; 
			} 
			else if(dir==4){ 
				snake.head.x++; 
			} 
			else if(dir==1){ 
				snake.head.y--; 
			} 
			else if(dir==2){ 
				snake.head.y++; 
			}else return; 
		 
		if(snake.isOut()) snake.dead(1); 
 
		snake.body.add(0,oxy); 
		if(snake.isEat(food)){ 
			snake.length++; 
			if(speed >= 50) speed-=25; 
			food = new Food(snake); 
		}else snake.body.remove(snake.length-1); 
		 
		if(snake.isPitch()) snake.dead(2); 
		repaint(); 
	} 
	//按键仅用于修改蛇的方向 
	public void keyPressed(KeyEvent e){ 
		int key = e.getKeyCode(); 
		//按鍵和行進方向相反，按鍵無效直接返回！ 
		if(((key==KeyEvent.VK_LEFT && snake.dir==4)||(key==KeyEvent.VK_UP && snake.dir==2) 
				||(key==KeyEvent.VK_DOWN && snake.dir==1)||(key==KeyEvent.VK_RIGHT && snake.dir==3))){ 
			return; 
		} 
			if(key == KeyEvent.VK_LEFT){ 
				snake.dir = 3; 
			} 
			else if(key == KeyEvent.VK_RIGHT){ 
				snake.dir = 4; 
			} 
			else if(key == KeyEvent.VK_UP){ 
				snake.dir = 1; 
			} 
			else if(key == KeyEvent.VK_DOWN){ 
				snake.dir = 2; 
			}else return; 
		 
		 
	} 
	public void keyReleased(KeyEvent e){} 
	public void keyTyped(KeyEvent e){} 
	 
	public synchronized void run(){ 
		 while(true){ 
			try{Thread.sleep(speed); 
			}catch(Exception e){} 
			keyPressed(snake.dir); 
		} 
	} 
} 
public class GreedySnake extends JFrame{ 
	MyPanel mp; 
	Snake snake; 
	Food food; 
	Thread t; 
	public GreedySnake(){ 
		snake = new Snake(new Point(5,5)); 
		food = new Food(snake); 
		mp = new MyPanel(snake,food); 
		t = new Thread(mp); 
		t.start(); 
		add(mp); 
		addKeyListener(mp); 
		setTitle("GreedySnake"); 
		setSize(40*10 + 15,40*10 + 38); 
		setLocation(200,200); 
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
		setVisible(true); 
	} 
	public static void main(String[] args){ 
		new GreedySnake(); 
	} 
}