Java-银行计算利息

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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);}}