Java 银行计算利息

package package2;public class Bank {int saveMoney;int year;double interest;double interestRate=0.29;public double computerInterest(){interest=year*interestRate*saveMoney;return interest;}public void setInterestRate(double rate){interestRate=rate;}}package package2;public class ConstructionbBank 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*saveMoney;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",saveMoney,super.year,day,interest);return interest;}}package package2;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*saveMoney;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",saveMoney,super.year,day,interest);return interest;}}package package2;public class SaveMoney {public static void main(String[] args) {int amount=8000;ConstructionbBank bank1=new ConstructionbBank();bank1.saveMoney=amount;bank1.year=8.236;bank1.setInterestRate(0.035);double interest1=bank1.computerInterest();BankOfDalian bank2=new BankOfDalian();bank2.saveMoney=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);}}