Package org.apache.commons.collections
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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Interface Summary Interface Description 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 aMap.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 orderedMap.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 ofBagthat 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 Class Description ArrayStack An implementation of theStackAPI that is based on anArrayListinstead of aVector, so it is not synchronized to protect against multi-threaded access.BagUtils BeanMap Deprecated. Identical class now available in commons-beanutils (full jar version).BeanMap.MyMapEntry Map entry used byBeanMap.BinaryHeap Deprecated. Replaced by PriorityBuffer in buffer subpackage.BoundedFifoBuffer Deprecated. Moved to buffer subpackage.BufferUtils Provides utility methods and decorators forBufferinstances.ClosureUtils ClosureUtilsprovides reference implementations and utilities for the Closure functor interface.CollectionUtils Provides utility methods and decorators forCollectioninstances.ComparatorUtils Provides convenient static utility methods forComparatorobjects.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 forEnumerationinstances.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 FactoryUtilsprovides reference implementations and utilities for the Factory functor interface.FastArrayList A customized implementation ofjava.util.ArrayListdesigned to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.FastHashMap A customized implementation ofjava.util.HashMapdesigned to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.FastTreeMap A customized implementation ofjava.util.TreeMapdesigned 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 forIteratorinstances.ListUtils Provides utility methods and decorators forListinstances.LRUMap Deprecated. Moved to map subpackage.MapUtils MultiHashMap Deprecated. Class now available as MultiValueMap in map subpackage.PredicateUtils PredicateUtilsprovides 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 StaticBucketMap Deprecated. Moved to map subpackage.SynchronizedPriorityQueue Deprecated. PriorityQueue is replaced by the Buffer interface, see buffer subpackage.TransformerUtils TransformerUtilsprovides 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 Exception Description 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.