Java 帐户类工作不正常

我犯了一个错误

帐户ID为：0 账户余额为：0.0

帐户ID是：1122 账户余额为20500.0 主线程java.lang中出现异常。错误：未解决的编译问题： 类型帐户中的getMontlyInterestRatedouble方法不适用于参数

public class AccountDriver {
    public static void main(String[] args) {

        // ID, Balance, Annual Interest Rate
        Account number1 = new Account();
        Account number2 = new Account(1122, 20000.00, 0.045);

        // Default account
        System.out.println("The Account ID is:  " + number1.getId());
        System.out.println("The Account Balance is: " + number1.getBalance());
        // System.out.println("The Account Balance is: "+
        // number1.getMontlyInterest());
        System.out.println("");

        // Ask to withdraw 2500
        System.out.println("The Account ID is:  " + number2.getId());
        number2.withdraw(2500.00);
        number2.deposit(3000.00);
        System.out.println("Account Balance is " + number2.getBalance());
        // System.out.println("The montly interest is : "+
        // number2.getMontlyInterest());
        System.out.println("");

    }
}

public class Account {

    private int id = 0;
    private double balance = 0;
    private double annualInterestRate = 0;

    public Account(int id, double balance, double annualInterestRate) {
        this.setId(id);
        this.setBalance(this.balance);
        this.setBalance(annualInterestRate);
    }

    public Account() {
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

    public void setAnnualInterestRate(double annualInterestRate) {
        this.annualInterestRate = annualInterestRate;
    }

    public double getMontlyInterest(double montlyInterest) {
        // Given Formula
        // double MontlyInterest= this.balance * get.MontlyInterestRate();
        return montlyInterest;
    }

    public double getMontlyInterestRate(double montlyInterestRate) {
        // Given Formula
        montlyInterestRate = this.annualInterestRate / 12;
        return montlyInterestRate;

    }

    double withdraw(double amount) {
        return balance -= amount;
    }

    double deposit(double amount) {
        return balance += amount;
    }
}

---

您在代码中犯了两个小错误

在构造函数中，这两行

at Account.getMontlyInterest(Account.java:41)
at AccountDriver.main(AccountDriver.java:21)

应该是

this.setBalance(this.balance); // this.balance is the instance variable and not the parameter passed
                ^^^^ - this is not required, just use the balance parameter passed.
this.setBalance(annualInterestRate); // you are re-writing the balance with interest rate
     ^^^^^^^^^^ - You need to set annual interest rate and not the balance here.

现在，由于设置了AnnualInterestate，您可以通过如下修改GetMontlyInterestate方法来获得月利率

this.setBalance(balance); // sets the balance passed to the instance variable balance
this.setAnnualInterestRate(annualInterestRate); // sets the annual interest rate

您可以通过取消System.out.println代码的注释来打印您的月利率

月利息法如下所示：

System.out.println("The montly interest is : "+ number2.getMontlyInterestRate());

---

你为什么叫这一点；在帐户构造函数中两次，传递annualInterestate？哦，应该是this.setBalancethis.annualInterestate；对吧？不！应该是这样的；之前的setBalance调用应该是这个。setBalancebalance；-请注意，参数的前缀不是这个！montly interest法呢？@RJ你可能需要指出这一点。平衡，因为它不太明显……我明白了，谢谢。那么月利率呢，我放//这样程序就可以编译它了月利率很好问题是月利率method@user3304653-像这样说话对你没有好处。检查我所做的编辑并尝试它们。不要在这里大喊大叫，因为每个人都在这里帮助你。所有大写字母都意味着对别人大喊大叫，我也可以这么做，但我不想。哦，对不起，我不知道

System.out.println("The montly interest is : "+ number2.getMontlyInterestRate());

public double getMontlyInterest() { // no parameter required
    // Given Formula
    double MontlyInterest = this.balance * getMontlyInterestRate(); // balance multiplied by monthly interest rate
    return MontlyInterest; // return the value
}

System.out.println("The montly interest is : "+ number2.getMontlyInterest());