# 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.

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