Overview (Apache Commons Collections 4.1 API)

Packages
Package	Description
org.apache.commons.collections4	This package contains the interfaces and utilities shared across all the subpackages of this component.
org.apache.commons.collections4.bag	This package contains implementations of the `Bag` and `SortedBag` interfaces.
org.apache.commons.collections4.bidimap	This package contains implementations of the `BidiMap`, `OrderedBidiMap` and `SortedBidiMap` interfaces.
org.apache.commons.collections4.collection	This package contains implementations of the `Collection` interface.
org.apache.commons.collections4.comparators	This package contains implementations of the `Comparator` interface.
org.apache.commons.collections4.functors	This package contains implementations of the `Closure`, `Predicate`, `Transformer` and `Factory` interfaces.
org.apache.commons.collections4.iterators	This package contains implementations of the `Iterator` interface.
org.apache.commons.collections4.keyvalue	This package contains implementations of collection and map related key/value classes.
org.apache.commons.collections4.list	This package contains implementations of the `List` interface.
org.apache.commons.collections4.map	This package contains implementations of the `Map`, `IterableMap`, `OrderedMap` and `SortedMap` interfaces.
org.apache.commons.collections4.multimap	This package contains implementations of the `MultiValuedMap` interfaces.
org.apache.commons.collections4.multiset	This package contains implementations of the `MultiSet` and `SortedMultiSet` interfaces.
org.apache.commons.collections4.queue	This package contains implementations for the `Queue` interface.
org.apache.commons.collections4.sequence	This package provides classes to compare two sequences of objects.
org.apache.commons.collections4.set	This package contains implementations of the `Set`, `SortedSet` and `NavigableSet` interfaces.
org.apache.commons.collections4.splitmap	The "split map" concept is that of an object that implements the `Put` and `Get` interfaces, with differing generic types.
org.apache.commons.collections4.trie	This package contains implementations of the `Trie` interface.
org.apache.commons.collections4.trie.analyzer	This package contains various `KeyAnalyzer` implementations.