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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast operations; it provides also big (64-bit) arrays, sets, and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. This jar (fastutil-core.jar) contains data structures based on integers, longs, doubles, and objects, only; fastutil.jar contains all classes. If you have both jars in your dependencies, this jar should be excluded.
/**
* Type-specific classes for object elements or keys.
*
*
* Whenever possible and useful, {@code fastutil} provides both typical
* collections, which compare objects using {@code equals()}, and
* {@linkplain it.unimi.dsi.fastutil.objects.ReferenceSet
* reference-based collections}, which use identity ({@code ==}). See
* the related comments in the overview.
*/
package it.unimi.dsi.fastutil.objects;