commons

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http://bwinterberg.blogspot.com/2009/09/introduction-to-google-collections.html Did you ever felt that working with the Java Collections Framework could be more elegant or efficient? Then you really should consider to use the Google Collections API . It's a great utility library every Java developer should know.

Introduction to Google Collections | Benjamin Winterberg

http://www.discursive.com/books/cjcook/reference/book.html

Common Java Cookbook

Copyright © 2004-2012 Tim O'Brien. All Rights Reserved. This collection provides expert tips for using Java-based utilities from projects such as Apache Commons, Apache Lucene, and Apache Velocity. You don't have to be an expert, the book's solution-based format contains code examples for a wide variety of web, XML, network, testing, and application projects.
11/05/2009: fluentjava 0.3 Released . The whole EnumerationProtocol was implemented, as you can see here , with a little closure coercion as well. Fluent Sets, Fluent Maps and Fluent lists can be easily be created from other collections libraries. http://code.google.com/p/fluentjava/

fluentjava - Google Code