Package org.apache.commons.collections4
package org.apache.commons.collections4
Interfaces and utilities shared across all packages.
The following collection implementations are provided in the package:
- ArrayStack - a non synchronized Stack that follows the same API as
java.util Stack
-
ClassDescriptionArrayStack<E>Deprecated.Bag<E>Defines a collection that counts the number of times an object appears in the collection.BidiMap<K,
V> Defines a map that allows bidirectional lookup between key and values.Defines a collection that is bounded in size.BoundedMap<K,V> Defines a map that is bounded in size.Closure<T>Defines a functor interface implemented by classes that do something.ClosureUtilsprovides reference implementations and utilities for the Closure functor interface.Provides utility methods and decorators forCollectioninstances.Provides convenient static utility methods forComparatorobjects.Provides utility methods forEnumerationinstances.Equator<T>An equation function, which determines equality between objects of type T.Factory<T>Defines a functor interface implemented by classes that create objects.FactoryUtilsprovides reference implementations and utilities for the Factory functor interface.A FluentIterable provides a powerful yet simple API for manipulating Iterable instances in a fluent manner.Runtime exception thrown from functors.Get<K,V> The "read" subset of theMapinterface.IterableGet<K,V> The "read" subset of theMapinterface.IterableMap<K,V> Defines a map that can be iterated directly without needing to create an entry set.IterableSortedMap<K,V> Provides utility methods and decorators forIterableinstances.Provides static utility methods and decorators forIteratorinstances.KeyValue<K,V> Defines a simple key value pair.Provides utility methods and decorators forListinstances.ListValuedMap<K,V> Defines a map that holds a list of values against each key.MapIterator<K,V> Defines an iterator that operates over aMap.MultiMap<K,V> Deprecated.since 4.1, useMultiValuedMapinsteadProvides utility methods and decorators forMultiValuedMapinstances.MultiSet<E>Defines a collection that counts the number of times an object appears in the collection.An unmodifiable entry for an element and its occurrence as contained in a MultiSet.Provides utility methods and decorators forMultiSetinstances.MultiValuedMap<K,V> Defines a map that holds a collection of values against each key.OrderedBidiMap<K,V> Defines a map that allows bidirectional lookup between key and values and retains and provides access to an ordering.Defines an iterator that operates over an ordered container.OrderedMap<K,V> Defines a map that maintains order and allows both forward and backward iteration through that order.OrderedMapIterator<K,V> Defines an iterator that operates over an orderedMap.Predicate<T>Defines a functor interface implemented by classes that perform a predicate test on an object.PredicateUtilsprovides reference implementations and utilities for the Predicate functor interface.Put<K,V> The "write" subset of theMapinterface.Provides utility methods and decorators forQueueinstances.Defines an iterator that can be reset back to an initial state.Defines a list iterator that can be reset back to an initial state.An unmodifiable view of a set that may be backed by other sets.SetValuedMap<K,V> Defines a map that holds a set of values against each key.SortedBag<E>Defines a type ofBagthat maintains a sorted order among its unique representative members.SortedBidiMap<K,V> Defines a map that allows bidirectional lookup between key and values and retains both keys and values in sorted order.Transformer<I,O> Defines a functor interface implemented by classes that transform one object into another.TransformerUtilsprovides reference implementations and utilities for the Transformer functor interface.Trie<K,V> Defines the interface for a prefix tree, an ordered tree data structure.A collection ofTrieutilities.Marker interface for collections, maps and iterators that are unmodifiable.
ArrayDequeinstead (available from Java 1.6)