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## Package org.apache.commons.collections

This package contains the interfaces and utilities shared across all the subpackages of this component.

See:
Description

Interface Summary
Bag | Defines a collection that counts the number of times an object appears in the collection.
BidiMap | Defines a map that allows bidirectional lookup between key and values.
BoundedCollection | Defines a collection that is bounded in size.
BoundedMap | Defines a map that is bounded in size.
Buffer | Defines a collection that allows objects to be removed in some well-defined order.
Closure | Defines a functor interface implemented by classes that do something.
Factory | Defines a functor interface implemented by classes that create objects.
IterableMap | Defines a map that can be iterated directly without needing to create an entry set.
KeyValue | Defines a simple key value pair.
MapIterator | Defines an iterator that operates over a `Map`.
MultiMap | Defines a map that holds a collection of values against each key.
OrderedBidiMap | Defines a map that allows bidirectional lookup between key and values and retains and provides access to an ordering.
OrderedIterator | Defines an iterator that operates over an ordered collection.
OrderedMap | Defines a map that maintains order and allows both forward and backward iteration through that order.
OrderedMapIterator | Defines an iterator that operates over an ordered `Map`.
Predicate | Defines a functor interface implemented by classes that perform a predicate test on an object.
PriorityQueue | Deprecated. Replaced by the Buffer interface and implementations in buffer subpackage.
ResettableIterator | Defines an iterator that can be reset back to an initial state.
ResettableListIterator | Defines a list iterator that can be reset back to an initial state.
SortedBag | Defines a type of `Bag` that maintains a sorted order among its unique representative members.
SortedBidiMap | Defines a map that allows bidirectional lookup between key and values and retains both keys and values in sorted order.
Transformer | Defines a functor interface implemented by classes that transform one object into another.
Unmodifiable | Marker interface for collections, maps and iterators that are unmodifiable.

Class Summary
ArrayStack | An implementation of the `Stack` API that is based on an `ArrayList` instead of a `Vector`, so it is not synchronized to protect against multi-threaded access.
BagUtils | Provides utility methods and decorators for `Bag` and `SortedBag` instances.
BeanMap | Deprecated. Identical class now available in commons-beanutils (full jar version).
BeanMap.MyMapEntry | Map entry used by `BeanMap`.
BinaryHeap | Deprecated. Replaced by PriorityBuffer in buffer subpackage.
BoundedFifoBuffer | Deprecated. Moved to buffer subpackage.
BufferUtils | Provides utility methods and decorators for `Buffer` instances.
ClosureUtils | `ClosureUtils` provides reference implementations and utilities for the Closure functor interface.
CollectionUtils | Provides utility methods and decorators for `Collection` instances.
ComparatorUtils | Provides convenient static utility methods for `Comparator` objects.
CursorableLinkedList | Deprecated. Use new version in list subpackage, which has been rewritten and now returns the cursor from the listIterator method.
DefaultMapBag | Deprecated. Moved to bag subpackage as AbstractMapBag.
DefaultMapEntry | Deprecated. Use the version in the keyvalue subpackage.
DoubleOrderedMap | Deprecated. Replaced by TreeBidiMap in bidimap subpackage.
EnumerationUtils | Provides utility methods for `Enumeration` instances.
ExtendedProperties | This class extends normal Java properties by adding the possibility to use the same key many times concatenating the value strings instead of overwriting them.
FactoryUtils | `FactoryUtils` provides reference implementations and utilities for the Factory functor interface.
FastArrayList | A customized implementation of `java.util.ArrayList` designed to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.
FastHashMap | A customized implementation of `java.util.HashMap` designed to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.
FastTreeMap | A customized implementation of `java.util.TreeMap` designed to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.
HashBag | Deprecated. Moved to bag subpackage and rewritten internally.
IteratorUtils | Provides static utility methods and decorators for `Iterator` instances.
ListUtils | Provides utility methods and decorators for `List` instances.
LRUMap | Deprecated. Moved to map subpackage.
MapUtils | Provides utility methods and decorators for `Map` and `SortedMap` instances.
MultiHashMap | Deprecated. Class now available as MultiValueMap in map subpackage.
PredicateUtils | `PredicateUtils` provides reference implementations and utilities for the Predicate functor interface.
ProxyMap | Deprecated. Moved to map subpackage as AbstractMapDecorator.
ReferenceMap | Deprecated. Moved to map subpackage.
SequencedHashMap | Deprecated. Replaced by LinkedMap and ListOrderedMap in map subpackage.
SetUtils | Provides utility methods and decorators for `Set` and `SortedSet` instances.
StaticBucketMap | Deprecated. Moved to map subpackage.
SynchronizedPriorityQueue | Deprecated. PriorityQueue is replaced by the Buffer interface, see buffer subpackage.
TransformerUtils | `TransformerUtils` provides reference implementations and utilities for the Transformer functor interface.
TreeBag | Deprecated. Moved to bag subpackage and rewritten internally.
UnboundedFifoBuffer | Deprecated. Moved to buffer subpackage.

Exception Summary
BufferOverflowException | The BufferOverflowException is used when the buffer's capacity has been exceeded.
BufferUnderflowException | The BufferUnderflowException is used when the buffer is already empty.
FunctorException | Runtime exception thrown from functors.

## Package org.apache.commons.collections Description

This package contains the interfaces and utilities shared across all the subpackages of this component.

The following collection implementations are provided in the package:

- ArrayStack - a non synchronized Stack that follows the same API as java util Stack
- ExtendedProperties - extends the Properties class to add extra functionality

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