Collections
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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 ...
Last Release on Jul 29, 2013
Java implementation of a concurrent trie hash map from Scala collections library
Last Release on Sep 18, 2014
Guava Collections is a collections extension library with expanded collection types, implementations, and utility methods for dealing with aggregate data.
Last Release on Apr 26, 2010

Relocated → com.google.guava » guava
Primitive-type collections based on CERN's Colt Java API
Last Release on Apr 12, 2010
Implementation of a concurrent map with weak keys and a detached thread local storage.
Last Release on Nov 28, 2020
Utility library for collections, comparators and iterator classes
Last Release on Oct 23, 2020

A Java 8 collections helper library. Whenever possible, it tries to be API-compatible to Google Guava.
Last Release on Mar 31, 2016

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.
Last Release on Apr 20, 2007

Relocated → it.unimi.dsi » fastutil
GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings.
Last Release on Mar 14, 2016

Efficient collections for sets and maps that has primitive types as keys.
Last Release on Apr 29, 2020