August 2018
Intermediate to advanced
524 pages
14h 45m
English
Content preview from Java Projects - Second Edition
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Map
A Map pairs keys and values. If we want to approach a Map from the Collection point of view, then a Map is a collection of key/value pairs. You can put key/value pairs into a Map and you can get a value based on a key. Keys are unique in the same way as elements in a Set. If you look at the source code of the different implementations of the Set interface, you may see that some of them are implemented as a wrapper around a Map implementation where the values are simply discarded.
The interface defines a lot of methods. The two most important methods are put() and get(). The put(key,value) method can be used to store a key/value pair in the map. If there is a pair that has a key that equals() the key we want to set in the pair, then the ...
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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.