Package org.apache.commons.collections4.multiset

package org.apache.commons.collections4.multiset

Implements the MultiSet interface. A multiset stores an object and a count of the number of occurrences of the object.

The following implementations are provided in the package:

• HashMultiSet - implementation that uses a HashMap to store the data
• TreeMultiSet - implementation that uses a TreeMap to store the data

The following decorators are provided in the package:

• Predicated - ensures that only elements that are valid according to a predicate can be added
• Synchronized - synchronizes method access for multithreaded environments
• Transformed - transforms elements as they are added
• Unmodifiable - ensures the multiset cannot be altered

Related Packages

Package	Description
org.apache.commons.collections4	Interfaces and utilities shared across all packages.

Classes

Class	Description
AbstractMapMultiSet<E>	Abstract implementation of the MultiSet interface to simplify the creation of subclass implementations.
AbstractMapMultiSet.EntrySetIterator<E>	Inner class EntrySetIterator.
AbstractMapMultiSet.MultiSetEntry<E>	Inner class MultiSetEntry.
AbstractMapMultiSet.MutableInteger	Mutable integer class for storing the data.
AbstractMapMultiSet.UniqueSetIterator<E>	Inner class UniqueSetIterator.
AbstractMultiSet<E>	Abstract implementation of the MultiSet interface to simplify the creation of subclass implementations.
AbstractMultiSet.AbstractEntry<E>	Inner class AbstractEntry.
AbstractMultiSet.EntrySet<E>	Inner class EntrySet.
AbstractMultiSet.UniqueSet<E>	Inner class UniqueSet.
AbstractMultiSetDecorator<E>	Decorates another MultiSet to provide additional behavior.
AbstractSortedMultiSetDecorator<E>	Decorates another SortedMultiSet to provide additional behavior.
HashMultiSet<E>	Implements MultiSet, using a HashMap to provide the data storage.
PredicatedMultiSet<E>	Decorates another MultiSet to validate that additions match a specified predicate.
PredicatedSortedMultiSet<E>	Decorates another SortedMultiSet to validate that additions match a specified predicate.
SynchronizedMultiSet<E>	Decorates another MultiSet to synchronize its behavior for a multithreaded environment.
SynchronizedSortedMultiSet<E>	Decorates another SortedMultiSet to synchronize its behavior for a multithreaded environment.
TransformedMultiSet<E>	Decorates another MultiSet to transform objects that are added.
TransformedSortedMultiSet<E>	Decorates another SortedMultiSet to transform objects that are added.
TreeMultiSet<E>	Implements SortedMultiSet, using a TreeMap to provide the data storage.
UnmodifiableMultiSet<E>	Decorates another MultiSet to ensure it can't be altered.
UnmodifiableSortedMultiSet<E>	Decorates another SortedMultiSet to ensure it can't be altered.