JAVA简版贪吃蛇

package com.wxh.snake;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Snake {
  public static void main(String[] args) {

    JFrame jf=new JFrame();
    jf.setBounds(400, 200, 432, 454);
    jf.setLayout(null);
    jf.setTitle("贪吃蛇");
    jf.setDefaultCloseOperation(3);
    
    SnakePanel sp=new SnakePanel();
    
    jf.add(sp);
    
    jf.setVisible(true);
    
    sp.requestFocus(true);
    
    sp.headGo();
    
  }
}

class SnakePanel extends JPanel implements KeyListener{
  private int speed=400;//蛇移动的速度
  private int fangxiang=4;//运动方向
  private JPanel[] jps=new JPanel[400];
  //定义一个蛇头
  private Rect headRect;
  //定义整个身体
  private ArrayList<Rect> list;
  
  
  //定义食物小方块
  private Rect foodRect;
  
  public SnakePanel(){
    //初始化舌头的坐标
    headRect=new Rect(0,0);
    list=new ArrayList<Rect>();
    //把舌头添加进去
    list.add(headRect);
    
    //产生一个食物
    foodRect=randomFood();
    
    this.setSize(419,419);
    this.setBackground(Color.black);
    this.setLayout(new GridLayout(20, 20, 1, 1));
    for(int i=0;i<jps.length;i++){
      jps[i]=new JPanel();
      jps[i].setBackground(Color.green);
      this.add(jps[i]);
    }
    this.addKeyListener(this);    
  }
  
  
  //随机食物的方法
  public Rect randomFood(){
    return new Rect((int)(Math.random()*20)*21,(int)(Math.random()*20)*21);
  }
  
  //判断食物是否被吃到
  public boolean eat(){
    boolean flag=false;
    if(headRect.getX()==foodRect.getX() && headRect.getY()==foodRect.getY()){
      flag=true;
      if(speed>=200){
        speed-=50;
      }else if(speed>=100){
        speed-=20;
      }else if(speed>=40){
        speed-=4;
      }else if(speed == 10){
        
      }
      
    }   
    return flag;
  }
  
  
  @Override
  public void paint(Graphics g) {
    super.paint(g);
    g.setColor(Color.red);
    //g.fillRect(headRect.getX(), headRect.getY(), 20, 20); //画舌头
    
    
    //画整个蛇
    for(int i=0;i<list.size();i++){
      g.fillRect(list.get(i).getX(), list.get(i).getY(), 20, 20);
    }
    
    
    g.fillRect(foodRect.getX(), foodRect.getY(), 20, 20);//画食物
  }
  
  
  //身体移动
  public void bodyGo(){
    for(int i=list.size()-1;i>0;i--){
      list.get(i).setX(list.get(i-1).getX());
      list.get(i).setY(list.get(i-1).getY());
    }
  }
  
  //判断游戏结束
  
  
  //蛇头运动
  public void headGo(){
    while(true){
      bodyGo();     
      if(fangxiang==1){
        headRect.setY(headRect.getY()-21);
      }else if(fangxiang==2){
        headRect.setY(headRect.getY()+21);
      }else if(fangxiang==3){
        headRect.setX(headRect.getX()-21);
      }else if(fangxiang==4){
        headRect.setX(headRect.getX()+21);
      } 
      repaint();
      if(eat()){
        list.add(foodRect);
        foodRect=randomFood();//如果食物被吃到，则将食物的坐标改动
      }
      try {
        Thread.sleep(speed);//睡眠控制速度
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
  

  @Override
  public void keyPressed(KeyEvent e) {
    int i=e.getKeyCode();
    if(i==KeyEvent.VK_UP){
      fangxiang=1;
    }else if(i==KeyEvent.VK_DOWN){
      fangxiang=2;
    }else if(i==KeyEvent.VK_LEFT){
      fangxiang=3;
    }else if(i==KeyEvent.VK_RIGHT){
      fangxiang=4;      
    }
    repaint();
  }
  @Override
  public void keyReleased(KeyEvent e) {
    // TODO Auto-generated method stub
    
  }
  @Override
  public void keyTyped(KeyEvent e) {
    // TODO Auto-generated method stub
    
  } 
}


class Rect{
  private int x;
  private int y;  
  
  public Rect() {
  }
  public Rect(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;
  }
  
}