我正在做一个基于uml的银行系统，这是我最近得到的。我在完成一些方法时遇到了问题，而我自己尝试了一些方法来完成它。
如下所示。我的方法“addinterest（）”不会向一个帐户的余额中添加任何类型的利息。可能是支票户头，也可能是储蓄户头。它只是没有添加它。
还有一个问题，在要求中说，在每一个新客户创建之后，就要创建两个帐户。我希望我做的是正确的，一些更正将不胜感激！我知道代码还没有100%完成，但我正在一点一点地完成。
帐户.java

package com.company;

public class Account {
    public static Double interest = 0.042;
    private static Long number = 0L;
    private Double balance = 0.0;

    public Account(Double interest, Long number, Double balance) {

        number = Account.number;
        balance = this.balance;
    }

    public void deposit(Integer amount) {

        balance = balance + amount;

    }

    public double addInterest() {
        return balance += balance * interest;
    }

    public double getBalance() {

        return balance;

    }

    public static void main(String[] args) {
        Account checkingaccount = new Account(interest, 1L, 0.0);
        Account savingsaccount = new Account(interest, 1L, 0.0);

        Customer customer = new Customer(1L, "John Doe", savingsaccount, checkingaccount);

        checkingaccount.deposit(500);
        savingsaccount.deposit(100);

        checkingaccount.addInterest();
        savingsaccount.addInterest();

        System.out.println("Has a balance of " + checkingaccount.getBalance());

        System.out.println("Has a balance of " + savingsaccount.getBalance());

        System.out.println("Total balance is " + customer.totalBalance());

    }
}

客户.java

class Customer {
    private static Long lastNumber;
    private String name;
    private Account savingsAccount;
    private Account checkingAccount;

public Customer(Long lastNumber, String name, Account savingsAccount, Account checkingAccount){
    //add lastnumber
    this.name = name;
    this.savingsAccount = savingsAccount;
    this.checkingAccount = checkingAccount;
}

public String getName(){
    return this.name;
}

public Account getCheckingaccount(Account checkingaccount){
    return checkingaccount;
}

//public Long getUniqueNumber(){
//
//}

public Account getSavingsaccount(Account savingsaccount){
    // return savingsAccount info
    return savingsaccount;
}

public double totalBalance(){
    // return totalbalance
    return savingsAccount.getBalance() + checkingAccount.getBalance();
}

}