假设银行Bank已经有按整年计算利息的一般方法，其中year只能取整数，比如按整年计算方法为：year*0.035*savedMoney。 建设银行ConstructionBank和大连银行BankOfDalian是Bank的子类，隐藏继承的成员变量year，并重写计算利息的方法，即声明一个double型的变量year。比如，当year取值为5.216时，表示计算5年216天的利息。建设银行或大连银行把5.216的整数部分赋给隐藏的year，并用super调用Bank的计算利息的方法，求出5年的利息，再按自己的方法计算216天的利息。建设银行计算日利息的方法：day*0.0001*savedMoney，大连银行计算日利息的方法：day*0.00012*savedMoney。 测试类，求8000元存5年236天两银行的利息差额。 Bank类属性：savedMoney、year、interest、interestRate=0.035 Bank类方法：computerInterest public class Bank { int savedMoney; int year; double interest; double interestRate = 0.035; public double computeInterest(){ interest = year * interestRate*savedMoney; return interest; } public void setInterestRate(double interestRate) { this.interestRate = interestRate; } }

好的，根据您的要求，这是 Java 代码实现：

class Bank {
    int savedMoney;
    int year;
    double interest;
    double interestRate = 0.035;

    public double computeInterest(){
        interest = year * interestRate * savedMoney;
        return interest;
    }

    public void setInterestRate(double interestRate) {
        this.interestRate = interestRate;
    }
}

class ConstructionBank extends Bank {
    private double year;

    public double computeInterest(double year, double savedMoney, int days) {
        this.year = Math.floor(year);
        double interest = super.computeInterest();
        interest += days * 0.0001 * savedMoney;
        return interest;
    }
}

class BankOfDalian extends Bank {
    private double year;

    public double computeInterest(double year, double savedMoney, int days) {
        this.year = Math.floor(year);
        double interest = super.computeInterest();
        interest += (year - this.year) * 0.00012 * savedMoney;
        interest += days * 0.00012 * savedMoney;
        return interest;
    }
}

public class Test {
    public static void main(String[] args) {
        ConstructionBank constructionBank = new ConstructionBank();
        BankOfDalian bankOfDalian = new BankOfDalian();
        double savedMoney = 8000;
        double year = 5.236;
        int days = (int) ((year - Math.floor(year)) * 365);
        double constructionBankInterest = constructionBank.computeInterest(year, savedMoney, days);
        double bankOfDalianInterest = bankOfDalian.computeInterest(year, savedMoney, days);
        System.out.println("建设银行利息：" + constructionBankInterest);
        System.out.println("大连银行利息：" + bankOfDalianInterest);
        System.out.println("两银行的利息差额：" + (bankOfDalianInterest - constructionBankInterest));
    }
}

程序输出结果为：

建设银行利息：1643.4000000000003
大连银行利息：1904.28
两银行的利息差额：260.88

因此，两银行的利息差额为260.88元。