Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more.<BR><BR>
It is memory efficient. Its most interesting class is <A HREF="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/MapMaker.html" target="_blank">MapMaker</A>, which is a ConcurrentMap builder, providing any combination of these features: soft or weak keys, soft or weak values, timed expiration, and on-demand computation of values. Check out their video in <A HREF="http://www.youtube.com/watch?v=ZeO%5FJ2OcHYM" target="_blank">Youtube</A>.

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more.

Guava - Google Core Libraries for Java

Fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion. It also provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.<BR><BR>It has support of bidirectional iterators. It has support of Big arrays and Big Lists with 64 Bit indices.

Fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion. It also provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.

Fastutil - Fast & compact type-specific collections for Java

Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities.
    <ul><li>Bag interface for collections that have a number of copies of each object</li>
	<li>Buffer interface for collections that have a well defined removal order, like FIFOs</li>
	<li>BidiMap interface for maps that can be looked up from value to key as well and key to value</li>
	<li>MapIterator interface to provide simple and quick iteration over maps</li>
	<li>Type checking decorators to ensure that only instances of a certain type can be added</li>
	<li>Transforming decorators that alter each object as it is added to the collection</li>
	<li>Composite collections that make multiple collections look like one</li>
	<li>Ordered maps and sets that retain the order elements are added in, including an LRU based map</li>
	<li>Identity map that compares objects based on their identity (==) instead of the equals method</li>
	<li>Reference map that allows keys and/or values to be garbage collected under close control</li>
	<li>Many comparator implementations</li>
	<li>Many iterator implementations</li>
	<li>Adapter classes from array and enumerations to collections</li>
	<li>Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure</li>
	</ul>

Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities.  It provides collection class like Identity map, Ordered map, Reference map, Composite collections, Bag interface etc.

Apache Commons - Alternative to Java collection

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Guava - Google Core Libraries for Java

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Guava - Google Core Libraries for Java

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