Question

我正在用Java做一个项目，而且我只是坚持了一部分。我有存储函数在SavingsAccount类中工作，但我似乎无法弄清楚如何在引擎类中调用它。对于我们的项目，我们必须允许用户使用BlueJ虚拟机创建多个银行帐户并在它们之间转移资金。我将发布我的引擎类和储蓄帐户类的相关代码...谢谢，任何帮助将不胜感激！

问题：我无法从一个帐户转移到另一个帐户，我在引擎类上收到错误消息。我想我正在向我汇款的帐户做错了...

储蓄帐户代码

public class SavingsAccount extends BankAccount
public void transfer (BankAccount that, double amount) 
 {
   if 
   (balance-amount < -80)
   balance = balance ;
   else
   {
       if 
       (amount <= balance)
            {
                this.balance = this.balance - amount;
                that.balance = that.balance + amount;
            }
       else
            {
               this.balance = this.balance - amount-20;
               that.balance = that.balance + amount;
            }
    }
 }

引擎类

public class engine
{
 SavingsAccount savings1 = new SavingsAccount();
 savings1.balance = 0;

 //code for other choices, such as deposit and withdraw... 

    if (selection2 == 3)
       {
          System.out.println ("How much would you like to transfer?");
          int transferAmount = in.nextInt ( );
          System.out.println ("Which account would you like to transfer the money to?");
          String thatAccount = in.next();
          savings1.withdraw (transferAmount);
          thatAccount.deposit (transferAmount);
          System.out.println ("You account balance is " + savings1.getBalance () + "!");

      }

Answer 1

我有一些obervation /建议如下：

您的transferAccount thatAccount是字符串String thatAccount = in.next();。你怎么能在那上面调用deposit ()方法？

我在deposit()类中没有看到withdraw()和SavingsAccount方法，希望BankAccount类中存在这些方法。

现在确定如何将余额初始化为saving1.balance=0;。它应该通过一些类方法完成，例如setBalance为saving1.setBalance(0);。

当您调用savings1.withdraw()方法时，余额为0。

希望这些能帮助您识别问题并纠正程序。

银行账户转账项目Java

1 个答案: