public class Account
{
String zhanghu;
double cunkuanyue;
//先初始化
Account(String zhanghu,double cunkuanyue)
{
this.zhanghu=zhanghu;
this.cunkuanyue=cunkuanyue;
}
//存款
double cunkuan(double qianshu)
{
if(qianshu<0)
{
System.out.println("钱数错误");
}
else
{
System.out.println("您存了"+qianshu);
this.cunkuanyue+=qianshu;
}
return this.cunkuanyue;
}
/*
void cunkuan(double qianshu)
{
//验证
if(qianshu<0)
{
System.out.println("钱数错误");
return;
}
System.out.println("我存了"+qianshu);
this.cunkuanyue+=qianshu;
}
*/
//取款
void qukuan(double qianshu)
{
if(qianshu>this.cunkuanyue)
{
System.out.println("余额不足");
return;
}
System.out.println("我取了"+qianshu);
this.cunkuanyue-=qianshu;
}
//查询余额
double getyue()
{
return this.cunkuanyue;
}
public static void main(String[] args)
{
Account a=new Account("123456",1000);
a.cunkuan(100);
System.out.println("查询余额="+a.getyue());
a.qukuan(200);
System.out.println("查询余额= "+a.getyue());
}
}
![](https://images2015.cnblogs.com/blog/917848/201605/917848-20160518141831763-1754065866.jpg)
![](https://images2015.cnblogs.com/blog/917848/201605/917848-20160518141932591-760569388.jpg)