求个简单点的Java程序 100行左右。 需要解释。

贪吃蛇游戏 望采纳

import java.awt.Button

import java.awt.Color

import java.awt.GridLayout

import java.awt.Point

import java.awt.event.KeyEvent

import java.awt.event.KeyListener

import java.util.*

import javax.swing.JFrame

import javax.swing.JOptionPane

public class Snake extends JFrame implements KeyListener{

int Count=0

Button[][] grid = new Button[20][20]

ArrayList<Point>snake_list=new ArrayList<Point>()

Point bean=new Point(-1,-1)//保存随机豆子【坐标】

int Direction = 1//方向标志 1:上2:下 3:左 4:右

//构造方法

public Snake()

{

//窗体初始化

this.setBounds(400,300,390,395)

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

GridLayout f=new GridLayout(20,20)

this.getContentPane().setBackground(Color.gray)

this.setLayout(f)

//初始化20*20个按钮

for(int i=0i<20i++)

for(int j=0j<20j++)

{

grid[i][j]=new Button()

this.add(grid[i][j])

grid[i][j].setVisible(false)

grid[i][j].addKeyListener(this)

grid[i][j].setBackground(Color.blue)

}

//蛇体初始化

grid[10][10].setVisible(true)

grid[11][10].setVisible(true)

grid[12][10].setVisible(true)

grid[13][10].setVisible(true)

grid[14][10].setVisible(true)

//在动态数组中保存蛇体按钮坐标【行列】信息

snake_list.add(new Point(10,10))

snake_list.add(new Point(11,10))

snake_list.add(new Point(12,10))

snake_list.add(new Point(13,10))

snake_list.add(new Point(14,10))

this.rand_bean()

this.setTitle("总分：0")

this.setVisible(true)

}

//该方法随机一个豆子，且不在蛇体上，并使豆子可见

public void rand_bean(){

Random rd=new Random()

do{

bean.x=rd.nextInt(20)//行

bean.y=rd.nextInt(20)//列

}while(snake_list.contains(bean))

grid[bean.x][bean.y].setVisible(true)

grid[bean.x][bean.y].setBackground(Color.red)

}

//判断拟增蛇头是否与自身有碰撞

public boolean is_cross(Point p){

boolean Flag=false

for(int i=0i<snake_list.size()i++){

if(p.equals(snake_list.get(i) )){

Flag=truebreak

}

}

return Flag

}

//判断蛇即将前进位置是否有豆子，有返回true，无返回false

public boolean isHaveBean(){

boolean Flag=false

int x=snake_list.get(0).x

int y=snake_list.get(0).y

Point p=null

if(Direction==1)p=new Point(x-1,y)

if(Direction==2)p=new Point(x+1,y)

if(Direction==3)p=new Point(x,y-1)

if(Direction==4)p=new Point(x,y+1)

if(bean.equals(p))Flag=true

return Flag

}

//前进一格

public void snake_move(){

if(isHaveBean()==true){//////////////有豆子吃

Point p=new Point(bean.x,bean.y)//【很重要，保证吃掉的是豆子的复制对象】

snake_list.add(0,p)//吃豆子

grid[p.x][p.y].setBackground(Color.blue)

this.Count++

this.setTitle("总分："+Count)

this.rand_bean() //再产生一个豆子

}else{///////////////////无豆子吃

//取原蛇头坐标

int x=snake_list.get(0).x

int y=snake_list.get(0).y

//根据蛇头坐标推算出拟新增蛇头坐标

Point p=null

if(Direction==1)p=new Point(x-1,y)//计算出向上的新坐标

if(Direction==2)p=new Point(x+1,y)//计算出向下的新坐标

if(Direction==3)p=new Point(x,y-1)//计算出向左的新坐标

if(Direction==4)p=new Point(x,y+1)//计算出向右的新坐标

//若拟新增蛇头碰壁，或缠绕则游戏结束

if(p.x<0||p.x>19|| p.y<0||p.y>19||is_cross(p)==true){

JOptionPane.showMessageDialog(null, "游戏结束！")

System.exit(0)

}

//向蛇体增加新的蛇头坐标,并使新蛇头可见

snake_list.add(0,p)

grid[p.x][p.y].setVisible(true)

//删除原蛇尾坐标，使蛇尾不可见

int x1=snake_list.get(snake_list.size()-1).x

int y1=snake_list.get(snake_list.size()-1).y

grid[x1][y1].setVisible(false)

snake_list.remove(snake_list.size()-1)

}

}

@Override

public void keyPressed(KeyEvent e) {

if(e.getKeyCode()==KeyEvent.VK_UP &&Direction!=2) Direction=1

if(e.getKeyCode()==KeyEvent.VK_DOWN &&Direction!=1) Direction=2

if(e.getKeyCode()==KeyEvent.VK_LEFT &&Direction!=4) Direction=3

if(e.getKeyCode()==KeyEvent.VK_RIGHT &&Direction!=3) Direction=4

}

@Override

public void keyReleased(KeyEvent e) { }

@Override

public void keyTyped(KeyEvent e) { }

public static void main(String[] args) throws InterruptedException {

Snake win=new Snake()

while(true){

win.snake_move()

Thread.sleep(300)

}

}

}

package com.zpppublic class Charge {

public static void main(String [] args) {

if(args.length ==0) {

System.out.println("parameter error!")

System.out.println("java com.zpp.Charge [int]")

return

}

int min = Integer.parseInt(args[0])

double money = 0.0

if (min <= 0) {

money =0.0

System.out.println("not money")

} else if (min <= 60) {

money = 2.0

} else {

money = 2.0 + (min - 60) * 0.01

}

System.out.println("please pay: " + money)

}

} 编译：javac -d . Charge.java运行：java com.zpp.Charge 111

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