Jakarta Commons Collections Package

Java Collections Framework extensions.

See:
Description

Jakarta-commons Collections

org.apache.commons.collections

Java Collections Framework extensions.

Other Packages

org.apache.commons.collections.comparators

Java Collections Framework extensions.

See also the java.util package.

Category	Classes	Comments
List Implementations	CursorableLinkedList FastArrayList	Special-purpose implementations of the List interface.
Map Implementations	BeanMap DefaultMapEntry ExtendedProperties FastHashMap FastTreeMap LRUMap SoftRefHashMap DoubleOrderedMap	Special-purpose implementations of the Map interface.
Stack and Queue Implementations	ArrayStack BinaryHeap PriorityQueue SynchronizedPriorityQueue	Special-purpose implementations of the Stack interface, as well as similar PriorityQueue interface.
Bag Interface and Implementations	Bag HashBag SortedBag TreeBag	New collections interface that keeps a count of its members.
Adapters	ArrayEnumeration ArrayIterator EnumerationIterator IteratorEnumeration	Access Java1-style containers as though they were Java2-style Collections and vice-versa.
Utilities	Closure CollectionUtils MapUtils	Manipulate collection objects, determine set theoretic properties, ensure type-safety, etc.
Transformation Tools	FilterIterator Predicate ProxyIterator Transformer TransformIterator	Create views or functors on a collection. If your collection represents X, these allow you to define and look at f(X).