October 2011
Beginner
432 pages
10h 18m
English
Content preview from Sams Teach Yourself Java™ in 24 Hours, Sixth EditionBecome 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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Building an Inheritance Hierarchy
Inheritance, which enables a variety of related classes to be developed without redundant work, makes it possible for code to be passed down from one class to another class to another class. This grouping of classes is called a class hierarchy, and all the standard classes you can use in your Java programs are part of a hierarchy.
Understanding a hierarchy is easier if you understand subclasses and superclasses. A class that inherits from another class is called a subclass. The class that is inherited from is called a superclass.
In the preceding WarGames example, the Modem class is the superclass of the ErrorCorrectionModem class. ErrorCorrectionModem is the subclass of Modem.
A class can have more than one ...
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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.