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The Google Collections Library 1.0 is a set of new collection types, implementations and related goodness for Java 5 and higher, brought to you by Google. It is a natural extension of the Java Collections Framework.

Its feature include:

  • New Collection types: Multimap, Multiset, BiMap and others
  • High-performance immutable implementations of the standard collection types, for example ImmutableSet
  • MapMaker, a builder for concurrent hash maps with many advanced features
  • Ordering, which can only be described as a "Comparator on steroids"
  • Iterators and Iterables utility classes: element-based equality, cycle, concat, partition, filter with predicate, transform with function, and much more
  • Lists, Sets and Maps utility classes: a plethora of convenient factory methods and much more
  • Forwarding collections, such as ForwardingSet, allowing you to customize collection behavior without subclassing
  • Implementation helpers like AbstractIterator
  • and still more



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