fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues for Java with a small memory footprint and fast access and insertion; it also includes a fast I/O API for binary and text files. The classes implement their standard counterpart interfaces (e.g., Map for maps) and can be plugged into existing code. Besides the usual features, fastutil provides reference-based containers (which do not use equals() to compare objects) and linked structures. Most iterators provided by fastutil classes are bidirectional, or even implement the standard list iterator interface. License: GNU Lesser General Public License (LGPL) Changes:
A few bugs have been fixed. There is a new set of type-specific Iterable classes.

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