同一属性的不同子类

Question

The example situation is as follows: I have a shop that rents items. An item (object of class Item) may be rent by PrivateCustomer or BusinessCustomer, which are both subclasses of Customer. An item has a String name and a reference to a customer object which rents it.

My problem is: How can I make it possible that both private and businness customer are accepted? Just using the Customer superclass (Giving the Item class the attribute private Customer rentBy) didn't seem to work, it doesn't accept a PrivateCustomer in the constructor then.

I know this is a very basic question, but I'm apparently searching with the wrong keywords as I can't find an answer.

Answer 1

Make sure in your code you are not using any PrivateCustomer or BusinessCustomer attributes, just Customer. If both Private And Business CUstomer inherit Customer, that should all work.

Sample code would help.