银行

package com.yunruo;

//银行账户
public class Zhang {

String zhanghao;//账号

double yue;//余额

//构造方法
Zhang(String zh)
{
zhanghao = zh;
}

//同时存钱
Zhang(String zh,double ck)
{
zhanghao = zh;
yue += ck;
}

//成员方法

//存钱
//有参数无返回值
void cunQian(double ck)
{
yue += ck;

System.out.println("存入" + ck);
}

//取钱
//有参数有返回值
boolean quQian(double qk)
{
if (qk<= yue)
{
yue -=qk;

System.out.println("取出" + qk);

return true;
}

else
{
System.out.println("余额不足");

return false;

}
}

//获取余额
double getYue()
{
return yue;
}

//显示账号和余额
//无参数无返回值
void shouZhang()
{
System.out.println("账号 = " + zhanghao + "余额 = " + yue);
}
}

package com.yunruo;

public class Ceshilei {

public static void main(String[] args) {
// TODO 自动生成的方法存根

//测试Zhang

Zhang ac1 = new Zhang("123",1000);

ac1.cunQian(1000);

ac1.quQian(9000);

if (ac1.quQian(300))

{
System.out.println("取钱成功");
}
else
{
System.out.println("取钱失败");
}

}

}