June 2004
Intermediate to advanced
848 pages
21h 28m
English
Content preview from Just Java™ 2
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Map, HashMap, and TreeMap
Map is a data structure interface that connects keys and values. Each key has at most one associated value. Some examples of key/value pairs would be driver's license number and “Object representing a licensed driver”, username and password, ISBN and book title. The first of each of these pairs is a key for uniquely retrieving the second. The most obvious way of storing a Map is as a two-column table, and you can get fancier from there.
The Map interface provides three views onto its collection of keys/values. You can see the map as a collection of keys, or as a collection of values, or as a collection of key/value pairs. Once you have these collections back, you can invoke the standard Collection method to get ...
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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.