具有多个类的java中的银行帐户客户端

Question

我正在尝试制作一个银行帐户计划，但我无法弄清楚如何让我的所有变量都可见，或者如何使我的代码的提款和存款方法可见。任何人都可以看看我的代码并告诉我有什么问题吗？我只想在客户端类中输入和输出。

由于

客户端类

public class Client {
  public static void main(String args[]) {
    Scanner input = new Scanner(System.in);       
    System.out.println("Enter your Name: ");
    String cusName = input.nextLine();
    System.out.println("Enter Account Type: ");
    String type = input.next();
    System.out.println("Enter Initial Balance: ");
    int bal = input.nextInt();
    BankAccount b1 = new BankAccount(cusName, num, type, bal);
    int menu;
    System.out.println("Menu");
    System.out.println("1. Deposit Amount");
    System.out.println("2. Withdraw Amount");
    System.out.println("3. Display Information");
    System.out.println("4. Exit");
    boolean quit = false;
    do {
      System.out.print("Please enter your choice: ");
      menu = input.nextInt();
      switch (menu) {
      case 1:
        b1.deposit();
        break;

      case 2:
        b1.withdraw();
        System.out.println("Current Account Balance=" + Balance);
        System.out.print("Enter withdrawal amount:");
        amount = input.nextInt();
        break;

      case 3:
        b1.display();
        break;

      case 4:
        quit = true;
        break;
      }
    } while (!quit);
  }
}

金钱类

public class Money
{

  static int accountNumber, Balance, amount;
  Scanner input = new Scanner(System.in);
  static String name, actype;
  public int deposit() {
    System.out.print("Enter depost amount:");
    amount = input.nextInt();
    if (amount < 0) {
      System.out.println("Invalid");
      return 1;
    }
    Balance = Balance + amount;
    return 0;
  }

  int withdraw()  {

    if (Balance < amount) {
      System.out.println("Not enough funds.");
      return 1;
    }
    if (amount < 0) {
      System.out.println("Invalid");
      return 1;
    }
    Balance = Balance - amount;
    return 0;
  }

}

BankAccount Class

class BankAccount {
  Scanner input = new Scanner(System.in);
  static String name, actype;
  static int bal, amt;
  Random randomGenerator = new Random();
  int accNo = randomGenerator.nextInt(100);

  BankAccount(String name, int accNo, String actype, int bal) {
    this.name = name;
    this.accNo = accNo;
    this.actype = actype;
    this.bal = bal;
  }
  void display() {
    System.out.println("Name:" + name);
    System.out.println("Account No:" + accNo);
    System.out.println("Balance:" + bal);

  }

  void dbal() {
    System.out.println("Balance:" + bal);
  }
}

Answer 1

1. 将Money添加到BankAccount并创建一个getter方法：

   class BankAccount {
      Scanner input = new Scanner(System.in);
      static String name, actype;
      static int bal, amt;
      Random randomGenerator = new Random();
      int accNo = randomGenerator.nextInt(100);
      Money money;
   
      BankAccount(String name, int accNo, String actype, int bal) {
       this.name = name;
       this.accNo = accNo;
       this.actype = actype;
       this.bal = bal;
       this.money = new Money();
     }
   
     public Money getMoney(){
        return this.money;
     }
     .....
   }
   

2. 使用bankaccount.getMoney()调用deposit和withdraw作为：

    b1.getMoney().deposit();
    b1.getMoney().withdraw();
   

此外，我建议制作Money类属性，例如amount，accntType ...非静态并通过构造函数设置。静态变量与类定义相关联，因此您不会按每个银行帐户维护它们。

Answer 2

我不打算为你回答这个问题。相反，我建议您阅读更多关于Java编程概念的内容，默认情况下会向您解释。

• Here is one on encapsulation, which is the main concept that you're asking about
• This is a great book on how to write code well, including things like keeping methods short
  • 特别是，您的主要方法应该分成更小的部分
  • 如果你不想买这本书，这是stack overflow question that talks about it。

如果您不想阅读这些链接，@ YogendraSingh非常好地回答了这个问题，请使用该答案。

Answer 3

对象的属性不应该是静态的，例如你的“name，actype，bal和amt”。此外，我认为您的资金等级应该存在，这些方法可以存入银行账户（您存入/取出银行账户）。