August 1999
Intermediate to advanced
224 pages
4h 25m
English
book
UML Distilled: A Brief Guide to the Standard Object Modeling Language, Second Edition
by Martin Fowler, Kendall Scott
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Reference Objects and Value Objects
One of the common things said about objects is that they have identity. This is true, but it is not quite as simple as that. In practice, you find that identity is important for reference objects, but not so important for value objects.
Reference objects are things like Customer. Here, identity is very important, because you usually want only one software object to designate a customer in the real world. Any object that references a Customer object will do so through a reference or pointer; all objects that reference this Customer will reference the same software object. That way, changes to a Customer are available to all users of the Customer.
If you have two references to a Customer and you wish to see whether ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.