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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.
fastutil
Provides type-specific classes for object elements or keys.
Whenever possible, fastutil provides both typical
collections, which compare objects using equals(), and
reference-based collections, which use equality
(==). See the related comments in the overview.
Of course, reference-based sorted sets and maps make no
sense, and are not generated.