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I seem to find all documentation regarding OOP too basic or too advanced. I'm trying to solve a specific problem and I can't get a nice solution without having to use Singletons or global instances or the such. I'm trying to create a DB based application: I have a DB with Boxes that are stored in some Location. So I created to tables: Boxes and Locations BOXES | id | Name | Location | ------------------------ | 1 | AA | 1 | | 2 | AB | 2 | LOCATIONS | id | Name | --------------------- | 1 | Garage | | 2 | Living Room | When trying to bring this to an Java application, I want to have a Box class that I can instantiate for every box and locations that I have in DB and put them in a list. My question is: how do I design Box and Location Classes? The immediate approach would be: class Box { int id; String name; Location location; } Class Location { int id; String name; } But then, how can I operate Locations properly?