java 银行存款程序设计,设计一个模拟银行存款和取款的程序

package computerworkthreechapter;

import java.util.*;

public class three_1 {

public static void main(String[] args) {

// TODO Auto-generated method stub

money bank=new money();

Scanner reader=new Scanner(System.in);

System.out.print("欢迎使用Appilcation系统，请按任意(除0)键进入!");

int choice=reader.nextInt();

while(choice!=0){

System.out.println("请输入选项:");

System.out.println("1.存款");

System.out.println("2.取款");

System.out.println("3.显示余额");

int a=reader.nextInt();

switch(a){

case 1:

System.out.print("请输入存款金额：");

double currency=reader.nextDouble();

bank.putmoney(currency);

bank.getyu();

bank.put();

System.out.print("nn");

break;

case 2:

System.out.print("请输入取款金额：");

double get=reader.nextDouble();

bank.getmoney(get);

bank.getyu();

try{

if(bank.yu<0){

System.out.println("当前余额为:"+bank.money3);

System.out.println("余额不足，不能取款!");

choice=0;

throw new IllegalArgumentException("余额为负");

}

else{

System.out.print("取款成功!");

bank.getyu();

bank.put();

}

}

catch(IllegalArgumentException e)

{

System.out.print("出现的异常是:"+e.toString());

}

break;

case 3:

bank.getyu();

System.out.println("当前余额为:"+bank.yu);

System.out.print("nn");

break;

default:

System.out.println("输入有误，请重新输入:");

}

}

}

}

class money

{

public static double yu;

public static  double money1=0;

public  static double money2=0;

public  static double money3=0;

public double bank1;

Scanner reader=new Scanner(System.in);

public void putmoney(double money)

{

this.money1+=money;

}

public void getmoney(double money)

{

this.money2+=money;

}

public void getyu()

{

yu=money1-money2;

}

public void put()

{

money3=yu;

}

}