银行卡系统

package oo.day06;
//银行卡系统
public class UnionPayTest {
public static void main(String[] args) {
ICBCImpl icbc1 = new ICBCImpl();
ICBC icbc2 = new ICBCImpl(); //向上造型
UnionPay icbc3 = new ICBCImpl(); //向上造型
}
}

interface UnionPay{ //银联接口
public double getBalance(); //查询余额
public boolean drawMoney(double number); //取钱
public boolean checkPwd(String input); //检查密码
}
interface ICBC extends UnionPay{ //工行接口
public void payOnline(double number); //在线支付
}
interface ABC extends UnionPay{ //农行接口
public boolean payTelBill(String phoneNum,double sum); //支付电话费
}
class ICBCImpl implements ICBC{ //工行卡
public double getBalance(){return 0.0;}
public boolean drawMoney(double number){return false;}
public boolean checkPwd(String input){return false;}
public void payOnline(double number){}
}
class ABCImpl implements ABC{ //农行卡
public double getBalance(){return 0.0;}
public boolean drawMoney(double number){return false;}
public boolean checkPwd(String input){return false;}
public boolean payTelBill(String phoneNum,double sum){return false;}
}