自助取款机

1、Account类

package LESSON5;
public class Account {
    public long id;
    public int password;
    public String name;
    public double balance=2000;
    public Account(long id,String name){
        this.id=id;
        this.name=name;        
    }
    public  void deposit(double money){
        balance+=money;
        System.out.println("当前余额为："+balance);        
    }
    public  void withdraw(double money){        
        if(money<=balance){
            balance-=money;
            System.out.println("当前余额为："+balance);           
        }
        else{
            System.out.println("余额不足");
        }
    }
}

2、主程序

package LESSON5;
import java.util.*;
public class exercise3 {
    public static void main(String[] args) {
        int num=3;
        Account acc=new Account(123456,"张三");
        Scanner sc=new Scanner(System.in);
        System.out.println("欢迎来到自助银行");        
        while(true){        
        System.out.println("请输入密码");
        int pwd=sc.nextInt();        
        if(pwd==123)
        {    
            System.out.println(acc.name+"欢迎，您的账户为"+acc.id);
        while(true){
            System.out.println("请选择：1存款 2取款 3查询余额 4退出");
            int a=sc.nextInt();
        if(a==1){
            System.out.println("请输入存款金额");
            double money=sc.nextDouble();
            acc.deposit(money);         
        }
        else if(a==2){
            System.out.println("请输入取款金额");
            double money=sc.nextDouble();
            acc.withdraw(money);        
        }
        else if(a==3){
            System.out.println("余额为："+acc.balance);            
        }
        else if(a==4){
            System.exit(0);//退出jvm
        }
        else{
            System.out.println("输入错误");
            break;
        }              
    }
    }        
        else{
            num--;
            if(num==0){
                System.out.println("账户已冻结");
                break;     
            }
            System.out.println("密码错误,您还有"+num+"次机会");           
        }
        }
    }
}

 3、运行结果