调用一个方法从一个不同的类到另一个类&方法 [英] Calling a method from a different class to another class & method

问题描述

我有两个类，一个叫Driver，另一个叫BankAccount。在Driver中有一个称为Driver的方法，在BankAccount中有一个称为Deposit的方法。我收到一个错误，说：当我尝试从我的驱动程序方法调用BankAccount.Deposit时，非静态方法Deposit（）不能从静态上下文引用。

I have two classes, one called Driver and another called BankAccount. In Driver there is a method called Driver, and in BankAccount a method called Deposit. I'm getting an error that says, "non-static method Deposit() cannot be referenced from a static context" when I try to call BankAccount.Deposit from my Driver method.

关于我应该对这些代码行做什么以使其运行的任何建议。

Any advice on what I should do to these lines of code to make it run.

 import javax.swing.JOptionPane;
public class Driver
{
    int choice;
    String number;
    //public Driver()
    public Driver()
    {
         String number = JOptionPane.showInputDialog("1. Deposit 2. Withdraw 3. Balance 4. Change name 5. Exit");
         int choice = Integer.parseInt(number);
         do
         {
         if( choice == 1)
         {
             BankAccount.Deposit() = new Deposit();
             Driver.Driver = new Driver();
            }else if(choice == 2)
          {
              BankAccount.Withdrawl = new Withdrawl();
              Driver.Driver = new Driver();
            }else if(choice == 3)
            {
               BankAccount.getBalance = new getBalance();
               JOptionPane.showDialog(balance);
               Driver.Driver = new Driver();
            }else if(choice == 4)
            {
                name = JOptionPane.showInputDialog(" Please enter a name");
                Driver.Driver = new Driver();
            }else if(choice ==5)
            {
                JOptionPane.showDialog("Goodbye" + name);
            }
        }while( choice >= 1 && choice <= 5);
}
}

这里是BankAccount方法

here is the BankAccount Method

 import javax.swing.JOptionPane;
public class BankAccount
{
double balance = 400;
double deposit;
double withdraw;
double Interest = 1.05;
String name;
String accountNumber;

public BankAccount()
{
name = null;
accountNumber = null;
balance = 0;
}

public double Deposit()
{
    String input = JOptionPane.showInputDialog("How much would you like to deposit?");
    deposit = Integer.parseInt(input);
    if (deposit < 10000)
    {
        balance = (deposit + balance);

    }
    return balance;
}

}

推荐答案

我不明白为什么你写了这样的代码。

I don't understand why you have written your code like this.

java中的方法名应以小写字母开头，如 ，而不是存款。

Method name in java should start with a small letter like deposit and not Deposit.

BankAccount 是一个类， Deposit 是一个非静态方法。

BankAccount is a class and Deposit is a non-static method in it.

因此，对于使用存款方法，您必须先创建一个 BankAccount 这样的类：

So for using Deposit method you must first create an object/instance of your BankAccount class like this :

BankAccount b =new BankAccount();

然后使用任何使用该对象引用的方法：

And then use any method using that object reference :

b.Deposit();
b.Withdraw();

您应该这样写：

if( choice == 1)
{
     BankAccount b = new BankAccount();
     b.Deposit();
}

撤回时需要执行的操作

else if(choice == 2)
{
     BankAccount b = new BankAccount();
     b.Withdrawl();
     Driver.Driver = new Driver();
}

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