Java Open Source Projects Directory

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The Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0. This library is a natural extension of the Java Collections Framework. The major new types are:

 * BiMap. A Map that guarantees unique values, and supports an inverse view.
 * Multiset. A Collection that may contain duplicate values like a List, yet has order-independent equality like a Set. Often used to represent a histogram.
 * Multimap. Similar to Map, but may contain duplicate keys. Has subtypes SetMultimap and ListMultimap providing more specific behavior.