80题通关Java基础：第56题

目录

• ​​第56题 填写代码。运用继承进行两个银行存款计算利息的例子.(10分)​​

• ​​🍋题目描述​​
• ​​🍋源代码​​

第56题 填写代码。运用继承进行两个银行存款计算利息的例子.(10分)

🍋题目描述

下列Java应用程序输出银行在利息方面的信息。
请将下面程序的【代码】替换为Java程序代码，使程序运行正确。
文件Main.java

class Bank {
 int savedMoney;
 int year;
 double interest;
 double interestRate = 0.29;
 public double computerInterest() {
 interest=yearinterestRatesavedMoney;
 return 【代码1】;//返回利息
 }
 public void setInterestRate(double rate) {
 interestRate = rate;
 }
 }
 class ConstructionBank extends Bank {
 double year;
 public double computerInterest() {
 super.year=(int)year;
 double r = year-(int)year;
 int day=(int)(r1000);
 double yearInterest = 【代码2】 //super调用隐藏的computerInterest()方法
 double dayInterest = day0.0001savedMoney;
 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;
 }
 }
 class BankOfDalian【代码3】 Bank { //继承
 double year;
 public double computerInterest() {
 super.year=(int)year;
 double r = year-(int)year;
 int day=(int)(r1000);
 double yearInterest = 【代码4】// super调用隐藏的computerInterest()方法
 double dayInterest = day0.00012savedMoney;
 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;
 }
 }
 public class Main {
 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.【代码5】;//计算利息
 BankOfDalian bank2 = new BankOfDalian();
 bank2.savedMoney = amount;
 bank2.year = 8.236;
 bank2.setInterestRate(0.035);
 double interest2=bank2.【代码6】;//计算利息
 System.out.printf(“两个银行利息相差%f元\n”,interest2-interest1);
 }
 }

此题的上机步骤是:

1. 建立一个Java项目,名称可以按题号取名;
2. 建立一个类, 类的名称为Main。这一点非常重要；
3. 填代码；
4. 提交代码，注意题号要一致。

🍋源代码

class Bank {
   int savedMoney;
   int year;
   double interest;
   double interestRate = 0.29;
   public double computerInterest() {
      interest=year*interestRate*savedMoney;
      return  interest;//返回利息
   }
   public void setInterestRate(double rate) {
      interestRate = rate;
   }
}
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(); //super调用隐藏的computerInterest()方法
      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;
   }
}
class BankOfDalian extends Bank {  //继承
   double year;
   public double computerInterest() {
      super.year=(int)year;
      double r = year-(int)year;
      int day=(int)(r*1000);
      double yearInterest = super.computerInterest();// super调用隐藏的computerInterest()方法
      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;
   }
}
public class Main {
   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();//计算利息
      BankOfDalian bank2 = new BankOfDalian();
      bank2.savedMoney = amount;
      bank2.year = 8.236;
      bank2.setInterestRate(0.035);
      double interest2=bank2.computerInterest();//计算利息
      System.out.printf("两个银行利息相差%f元\n",interest2-interest1);
   }
}