ArrayList possible to read out the element name?

Heyho everyone!

My project is a bit bigger so I decided to short it a bit and showing only the problem code, which i have currently. On the first, im programming on a console. Reading six strings from a Scanner, before I save them in a variable i'm doing a validity check (length, special signs, etc...). So I decided to make this in an extra method check_newCustomer(). I used an ArrayList to return more as one value. So now is the point that I need the captured inputs in the main() function or any other method which writes the new Customer in the database. Problem is now i don't know how I can reference to userID, firstname, secondname... in other method. I just can refer with an index. But I would prefer it when i can use the variable names to refer to it. So its much easier on the other methods to handle with strings. Possible?

public static void main(String[] args) {
    ArrayList<String> newCustomer = new ArrayList<String>(); 
    check_newCustomer (newCustomer);
}


public static void check_newCustomer(ArrayList<String> newCustomer) throws IOException {
    String userID = null;
    String firstname = null;
    String secondname = null;
    String street = null;
    String zipcode = null;
    String city = null;

    // validity check before I fill the input fields
    ...

    // fill arraylist
    newCustomer.add(userID);
    newCustomer.add(firstname);
    newCustomer.add(secondname);
    newCustomer.add(street);
    newCustomer.add(zipcode);
    newCustomer.add(village);
}

Thanks!