求一个Java棋类游戏源码学习用，要求如下

import java.util.Scanner;

import java.util.Random;

public class Fangfa{

static int sum,sum1=0;

public static void main(String [] args){

int a=1,b=1,c=1;

int k=0,m=1;

int money =5000;

int zhu =0;

boolean flag = true;

Random rand = new Random();

Scanner input = new Scanner(System.in);

while(m==1){

while(flag){

System.out.println("掷色子开始！");

System.out.println("请下注 注:下注金额只能是50的倍数且不能超过1000");

zhu=input.nextInt();

if(zhu%50==0&&zhu<=1000&&zhu<=money){

System.out.println("下注成功");

System.out.println("买大请输入数字1，买小输入数字2");

k=input.nextInt();

a= rand.nextInt(6)+1;

b= rand.nextInt(6)+1;

c= rand.nextInt(6)+1;

sum=a+b+c;

if(k==1){

if(sum>9){

money+=zhu;

System.out.println("恭喜您猜对了,骰子点数为"+sum+"结果是大"+"余额为"+money);

}else{

money-=zhu;

System.out.println("很遗憾,骰子点数为"+sum+"结果是小"+"余额为"+money);

}

}

if(k==2){

if(sum<=9){

money+=zhu;

System.out.println("恭喜您猜对了,骰子点数为"+sum+"结果是小"+"余额为"+money);

}else{

money-=zhu;

System.out.println("很遗憾,骰子点数为"+sum+"结果是大"+"余额为"+money);

}

}

flag= false;

System.out.println("继续请按1,退出请按任意键");

m=input.nextInt();

if(m==1){

flag=true;

System.out.println("您选择的是继续");

}else{

flag=false;

System.out.println("欢迎您下次再来玩");

}

}else{

System.out.println("下注失败"+"余额为"+money);

}

}

}

}

}