Collections

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The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression. JavaEWAH is a word-aligned compressed variant of the Java bitset class. It uses a 64-bit run-length encoding (RLE) compression scheme. The goal of word-aligned compression is not to achieve the best compression, but rather to improve query processing time. Hence, we try to save CPU cycles, maybe at the expense of storage. However, the EWAH scheme we implemented is always more ...

A Persistent Java Collections Library

Commons Primitives

SpringSource Org Apache Commons Collections

This is Boundary's fork of Cliff Click's high scale lib. We will be maintaining this fork with bug fixes, improvements and versioned builds pushed to maven central.

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

An efficient sparse bitset implementation for Java

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.