February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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Shape Hierarchy
Now consider the Shape inheritance hierarchy in Fig. 9.3. This hierarchy begins with superclass Shape, which is extended by subclasses TwoDimensionalShape and ThreeDimensionalShape—Shapes are either TwoDimensionalShapes or ThreeDimensionalShapes. The third level of this hierarchy contains specific types of TwoDimensionalShapes and ThreeDimensionalShapes. As in Fig. 9.2, we can follow the arrows from the bottom of the diagram to the topmost superclass in this class hierarchy to identify several is-a relationships. For example, a Triangle is a TwoDimensionalShape and is a Shape, while a Sphere is a ThreeDimensionalShape and is a Shape. This hierarchy could contain many other classes. For example, ellipses and trapezoids also are ...
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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.