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High performance collections for Java

util-collection

Parallel Colt is a multithreaded version of Colt - a library for high performance scientific computing in Java. It contains efficient algorithms for data analysis, linear algebra, multi-dimensional arrays, Fourier transforms, statistics and ...

Java implementation of a concurrent trie hash map from Scala collections library

Guava Collections is a collections extension library with expanded collection types, implementations, and utility methods for dealing with aggregate data.

Primitive-type collections based on CERN's Colt Java API

Implementation of a concurrent map with weak keys and a detached thread local storage.

Utility library for collections, comparators and iterator classes

A Java 8 collections helper library. Whenever possible, it tries to be API-compatible to Google Guava.

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 includes a fast I/O API for binary and text files.