java--制作银行存钱以及计算利息

最新推荐文章于 2024-04-28 19:59:25 发布

酷酷小西欧

最新推荐文章于 2024-04-28 19:59:25 发布

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分类专栏： java 文章标签： java

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该项目为初学者设计，使用Java实现银行存取款利息计算。通过Bank类定义基本的利息计算，BankOfDalian和ConstructionBank类进行继承并自定义特定银行的计算规则。程序计算两个不同银行的利息差额。

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适合初学者做的一个关于银行存钱取钱利息的小项目，我这里创建了四个类，整体主要运用到java中的继承（extends)以及子类中运用super方法调用父类中的变量。

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;
    }
}

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元的利息:%f元\n",savedMoney,super.year,day,interest);
        return interest;
    }
}

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();//super调用隐藏的computerInterest()方法
        double dayInterest = day * 0.001 * savedMoney;
        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;
    }

}

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);
    }
}