面向对象—存款取款

 

 

String zhanghu;//定义账户
   double cunkuanyue;//定义存款余额
   Account(String zhanghu,double cunkuanyue)//初始化账户，存款余额
   {
       //this. 代表当前类
       this.zhanghu=zhanghu;
       this.cunkuanyue=cunkuanyue;
   }
   //存款  
   //有返回值带参数的方法
    double cunkuan(double qianshu) 
    {
        // 验证
        if (qianshu < 1) 
        {
            System.out.println("输入错误");

        } 
        else
        {
            System.out.println("存了" + qianshu);
            this.cunkuanyue += qianshu;
        }
        return this.cunkuanyue;
    }
   

   
 //取款
   //有返回值带参数的方法
    double qukuan(double qianshu) {
        if (qianshu > this.cunkuanyue) {
            System.out.println("余额不足");

        } else {
            System.out.println("取了" + qianshu);
            this.cunkuanyue -= qianshu;
        }
        return this.cunkuanyue;
    }
   //查询余额
   //有返回值无参数的方法
   double getyue()
   {
       return this.cunkuanyue;
   }
    
    
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        Account account=new Account("123456",1000);
        account.cunkuan(100);
        System.out.println("查询余额"+account.getyue());
        account.qukuan(300);
        System.out.println("查询余额"+account.getyue());
    }