Collections

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MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory. It is a fast, scalable and easy to use embedded Java database.

Types that extend and augment the Java Collections Framework.

The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression.

An efficient sparse bitset implementation for Java

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

Conversant Disruptor - very high throughput Java BlockingQueue

A high performance version of java.util.LinkedHashMap for use as a software cache.

Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0

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

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