June 2004
Intermediate to advanced
848 pages
21h 28m
English
Content preview from Just Java™ 2
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Granting Permission Through an Interface—Cloneable
When we looked at the Object class in Chapter 3, we saw that it has this method:
protected native Object clone() throws CloneNotSupportedException;
Java supports the notion of cloning, meaning to get a complete bit-for-bit duplicate of an object. Cloning, perhaps surprisingly, does not invoke any constructor.
Not every class should support the ability to clone. If I have a class that represents a set of objects that are unique in the real world, such as the ships in a company fleet, the operation of cloning doesn't make sense. You buy new ships, but you can't get exact duplicates in every detail (including, say, registration number) of an existing ship. However, methods (including the ...
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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.