Collections

 

Common Collections
* Bag interface for collections that have a number of copies of each object * Bag interface for collections that have a number of copies of each object * Buffer interface for collections that have a well defined removal order, like FIFOs * Buffer interface for collections that have a well defined removal order, like FIFOs * BidiMap interface for maps that can be looked up from value to key as well and key to value * BidiMap interface for maps that can be looked up from value to key as well and key to value * MapIterator interface to provide simple and quick iteration over maps * MapIterator interface to provide simple and quick iteration over maps * Type checking decorators to ensure that only instances of a certain type can be added * Type checking decorators to ensure that only instances of a certain type can be added * Transforming decorators that alter each object as it is added to the collection * Transforming decorators that alter each object as it is added to the collection * Composite collections that make multiple collections look like one * Composite collections that make multiple collections look like one * Ordered maps and sets that retain the order elements are added in, including an LRU based map * Ordered maps and sets that retain the order elements are added in, including an LRU based map * Identity map that compares objects based on their identity (==) instead of the equals method * Identity map that compares objects based on their identity (==) instead of the equals method * Reference map that allows keys and/or values to be garbage collected under close control * Reference map that allows keys and/or values to be garbage collected under close control * Many comparator implementations * Many comparator implementations * Many iterator implementations * Many iterator implementations * Adapter classes from array and enumerations to collections * Adapter classes from array and enumerations to collections * Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure * Utilities to test or create typical set-theory properties of collections such as union, intersection, and closure

Commons Primitives
Apache Jakarta Commons Primitives provides a collection of types and utilities optimized for working with Java primitives (boolean, byte, utilities optimized for working with Java primitives (boolean, byte, char, double, float, int, long, short). Generally, the Commons-Primitives classes are smaller, faster and easier to work with than their purely Object based alternatives.

Mango
Mango is a Java library consisting of a number of iterators, algorithms and functions, loosely inspired by the C++ Standard Template Library. and functions, loosely inspired by the C++ Standard Template Library.

Trove
Trove provides a free, fast, lightweight implementations of the java.util Collections API. These implementations are designed to be java.util Collections API. These implementations are designed to be pluggable replacements for their JDK equivalents.

FastUtil
fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and queues with a small memory type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion.

google-collections
The Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0. This library is a natural extension of the Java Collections Framework. The major new types are: * BiMap. A Map that guarantees unique values, and supports an inverse view. * BiMap. A Map that guarantees unique values, and supports an inverse view. * Multiset. A Collection that may contain duplicate values like a List, yet has order-independent equality like a Set. Often used to represent a histogram. * Multimap. Similar to Map, but may contain duplicate keys. Has subtypes SetMultimap and ListMultimap providing more specific behavior.

PCJ
Primitive Collections for Java (PCJ) is a set of collection classes for Primitive Collections for Java (PCJ) is a set of collection classes for primitive data types in Java. The goal is to provide an efficient alternative to the Java Collections Framework (JCF) when using primitive data types, such as int, boolean, or double.

tclib
tclib - Type-Specific Collections Library. tclib - Type-Specific Collections Library.

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