December 2015
Beginner
698 pages
15h 16m
English
Content preview from Android Programming for BeginnersBecome 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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Arrays and ArrayLists are polymorphic
We already know that we can put objects into arrays and ArrayList. But being polymorphic means that they can handle objects of multiple different types as long as they have a common parent type, all within the same array or ArrayList.
In Chapter 9, Object-Oriented Programming, you learned that polymorphism roughly means different forms. But what does it mean to us in the context of arrays and ArrayList?
Boiled down to its simplest, any subclass can be used as part of the code that uses the super class.
For example, if we have an array of Animals, we could put any object that is a type, that is a subclass of Animal in the Animal array, perhaps, Cats and Dogs.
This means that we can write code that is simpler and ...
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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.
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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.