January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Interface or abstract class
There is always a debate over using either an interface or an abstract class. Here are a few rules to follow when deciding which way to go:
- Is-a versus Can-Do: Any type can inherit from one parent class only and multiple interfaces. If for the derived class B you can't say B Is-an A (A is the base type), don't use an interface but rather an interface. Interfaces imply a Can-Do relationship. If the Can-do functionality is applicable to different object types, go with an interface implementation. For example, for both
FileOutputStreamandByteOutputpuStream(and any of the other sibling implementations available), you can say they have an Is-a relationship withjava.io.OutputStream. Hence you will see thatOutputStream ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.