如何创建存根?

How to create a stub?

我正在尝试创建一个 Customer 的存根,据我所知这是一个假的 class,因为 myCustomer 无法解决这个问题。但是,我已经在网上到处查看任何基本教程或示例以创建存根,但找不到任何地方。

import java.util.*;

public class Bank {
    public int bankAccount(int customerNumber, int startingBalance){

    Scanner stdin = new Scanner(System.in);
        System.out.println("Welcome Everyone.");
        Customer myCustomer = Customer.getWithCustomerNumber(customerNumber);
        String name = myCustomer.name;
    }
}

我的 IDE (NetBeans) 自动创建了一个存根 Customer,如下所示:

private static class Customer {

    private String name;

    private static Customer getWithCustomerNumber(int customerNumber) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    public Customer() {
    }
}