java - 帐户类 Java OOP

Question

我已经创建了一个帐户类，但在第一次计算之后，它继续并将第二行加倍。我是否错过了代码中的任何内容？

public class Account
{
    private double balance; //STATE
    private double interestRate; //STATE
    private double rate;//STATE

    public Account()
    {
        balance = 0; 
        interestRate = 0;
    }

    public Account(double amount, double interestRate)
    {
        balance = amount;   
        rate = interestRate;

    } 

    public void deposit(double amount)
    {
        balance=balance+amount;
    }

    public void withdraw(double amount)
    {
        balance = balance - amount;
    }

    public void setInterest(double rate)
    {
        balance = balance + balance * rate;
        //this.setInterst = setInterest;  
        //setInterest = InterestRate / 12;
    }

    public double computeInterest(int n)
    {
        balance=Math.pow(balance*(1+rate),n/12); 
        return balance;
    }

    public double getsetInterest()
    {
        return rate;
    }

    public double getBalance()
    {
        return balance;
    }

    public void close()
    {
        balance =0;
    }

}

public class TestAccountInterest
{
    public static void main (String[] args)
    {
        Account acc1 = new Account(500, 0.1);//0.10);
        Account acc2 = new Account(400, 0.2); //0.20);

      /*************************************
       ACC1 ACCOUNT BELOW
       *************************************/
        acc1.deposit(500);
        acc1.withdraw(300);
        acc1.computeInterest(12);
        acc1.computeInterest(24);
        System.out.println(acc1.computeInterest(12));

        /**************************************
        ACC2 ACCOUNT BELOW
         **************************************/
        acc2.withdraw(200);
        acc2.deposit(800);
        acc2.computeInterest(24);
        System.out.println(acc2.computeInterest(24));

    }

}

不知道是我漏掉了什么还是代码写错了。

Answer 1

    acc1.computeInterest(12);
    acc1.computeInterest(24);

在我看来，您想要的是调用这些函数仅返回计算出的利息，但它不应该更改您的余额变量。

仅返回计算值，而不将其保存在@balance变量中。

这是我对你问题的解释，你有点含糊。