Bank类

public class Bank {

int savedMoney;

int year;

double interest;

double interestRate=0.29;

public double computerInterest(){

interest=year*interestRate*savedMoney;

return interest;

}

public void setInterestRate(double rate){

interestRate=rate;

}

}

ConstructionBank类

public class ConstructionBank extends Bank {

double year;

public double computerInterest(){

super.year=(int)year;

double r=year-(int)year;

int day=(int)(r*1000);

double yearInterest=super.computerInterest();

double dayInterest=day*0.0001*savedMoney;

interest=yearInterest+dayInterest;

System.out.printf("%d元存在建设银行%d年零%d天的利息：%f元\n",savedMoney,super.year,day,interest);

return interest;

}

}

BankOfDalian类

public class BankOfDalian extends Bank {

double year;

public double computerInterest(){

super.year=(int)year;

double r=year-(int)year;

int day=(int)(r*1000);

double yearInterest=super.computerInterest();

double dayInterest=day*0.00012*savedMoney;

interest=yearInterest+dayInterest;

System.out.printf("%d元存在大连银行%d年零%d天的利息：%f元\n",savedMoney,super.year,day,interest);

return interest;

}

}

SaveMoney类

public class SaveMoney {

public static void main(String[] args) {

int amount=8000;

ConstructionBank bank1=new ConstructionBank();

bank1.savedMoney=amount;

bank1.year=8.236;

bank1.setInterestRate(0.035);

double interest1=bank1.computerInterest();

BankOfDalian bank2=new BankOfDalian();

bank2.savedMoney=amount;

bank2.year=8.236;

bank2.setInterestRate(0.035);

double interest2=bank2.computerInterest();

System.out.printf("两个银行利息相差%f元\n",interest2-interest1);

}

}