将信用卡和借记卡类链接到银行帐户 Class

Question

我正在学习 Java，我的一项作业是创建信用卡和借记卡 classes，以便您可以在创建新卡时创建链接到新个人帐户的新卡.信用卡应该存储购买，当用户支付（全部或部分）时，从账户中扣除金额（加上 3% 的利息）。借记卡立即从账户中扣除购买金额。

我已经编写了所有内容并使其运行，但仅限于在帐户 class 中嵌套 classes。有没有一种方法可以将帐户、信用卡和借记卡作为三个独立的 classes，这样每次您创建一个新帐户时，您都可以选择创建链接到每个新个人帐户的卡？

免责声明：我正在删减部分代码，因为它们都是西班牙语，所以我不必全部翻译（主要是用于检查正数和类似内容的布尔值），但代码仍然有效.非常感谢！

package accounts;

public class Account {

    protected static double balance;
    protected static String accountNumber;

    public Account() {
    }

    public Account(String accountNumber, double balance) {
        Account.accountNumber = accountNumber;
        Account.balance = balance;
    }

    public double getBalance() {
        return balance;
    }

    public String getAccountNumber() {
        return accountNumber;
    }

    public void deposit(double depositAmount) {
            Account.balance += depositAmount;
        }

    public void extraction(double extractionAmount) {
            Account.balance -= extractionAmount;
        }

    public void showBalance() {
        System.out.println("Your current balance is: " + getBalance());
    }

    protected static class DebitCard {

        private String userName;
        private int cardNumber;

        public DebitCard () {
        }

        public DebitCard (String userName, int cardNumber) {
            this.userName = userName;
            this.cardNumber = cardNumber;
        }

        public String getUserName() {
            return userName;
        }

        public int getCardNumber() {
            return cardNumber;
        }

        public void debitPurchase(double purchaseAmount) {
                Account.balance -= purchaseAmount;
            }
    }

    protected static class CreditCard {

        private String userName;
        private int cardNumber;
        private double creditCardDebt;
        private double limit;

        public CreditCard () {
        }

        public CreditCard(String userName, int cardNumber, double limit) {
            this.userName = userName;
            this.cardNumber = cardNumber;
            this.limit = limit;
        }

        public String getUserName() {
            return userName;
        }

        public int getCardNumber() {
            return cardNumber;
        }

        public double getLimit() {
            return limit;
        }

        public double getCrediCardDebt() {
            return creditCardDebt;
        }

        public void creditCardPurchase(double purchaseAmount) {
            if (this.creditCardDebt + purchaseAmount > this.limit) {
                Error notEnoughLimit = new Error("There's not enough limit to make this purchase");
                throw notEnoughLimit ;
            } else {
                this.creditCardDebt += purchaseAmount + (purchaseAmount * 0.03);
                this.limit -= purchaseAmount;
                this.creditCardDebt += purchaseAmount + (purchaseAmount* 0.03);
                this.limit -= purchaseAmount;
            }
         }

        public void payCard(double payAmount) {
            Account.balance -= payAmount;
            this.creditCardDebt = this.creditCardDebt - payAmount;
        }
    }
}

Answer 1

是的，这是可能的。但在此之前，您应该解决将 balance 和 accountNumber 声明为 static 变量所引起的问题。通过这样做，您使每个 Account 实例共享一个帐号和一个余额。

这些变量也应该是 private 以便其他类无法直接访问或更改它们。

一旦你解决了这个问题，你就应该更改 Credit 和 Debit 的构造函数，将 Account 的实例作为一个参数。他们将其存储在私有字段中，然后通过对 Account 对象的操作来执行从 Account 添加和删除钱的操作。

将信用卡和借记卡类链接到银行帐户 Class

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将信用卡和借记卡类链接到银行帐户 Class