August 2003
Intermediate to advanced
672 pages
16h 23m
English
book
Programmer's Guide to Java™ Certification, A: A Comprehensive Primer, Second Edition
by Khalid A. Mughal, Rolf W. Rasmussen
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11.7. Implementing the equals(), hashCode(), and compareTo() Methods
The majority of the non-final methods of the Object class are meant to be overridden. They provide general contracts for objects, which the classes overriding the methods should honor.
It is important to understand how and why a class should override the equals() and hashCode() methods. Implementation of the compareTo() method of the Comparable interface is closely related to the other two methods.
Objects of a class that override the equals() method can be used as elements in a collection. If they override the hashCode() method, they can also be used as elements in a HashSet and as keys in a HashMap. Implementing the Comparable interface allows them to be used as elements in ...
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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.