October 2017
Intermediate to advanced
442 pages
12h 33m
English
Content preview from Architecting Modern Java EE Applications
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Value objects
Types of the business domain that do not form identifiable entities but only specific values are called value objects. Value objects are preferably immutable and therefore reusable, since the content can't change. Java enumerations are a good example of this. Any objects where identity doesn't matter will be realized as value objects. For example, for Java enumerations it doesn't matter which instance of Status.ACCEPTED is returned, here there is even only one enum instance which is used in all places. The same is true for a lot of types in the domain, such as addresses. As long as the value of the address pointing to 42 Wallaby Way, Sydney remains the same, it doesn't matter which address instance we refer to.
Depending on ...
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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.