org.apache.commons.collections4.bag

Class HashBag<E>

java.lang.Object

org.apache.commons.collections4.bag.AbstractMapBag<E>

org.apache.commons.collections4.bag.HashBag<E>

Type Parameters:

E - the type of elements in this bag

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Bag<E>

public class HashBag<E>
extends AbstractMapBag<E>
implements Serializable

Implements Bag, using a HashMap to provide the data storage. This is the standard implementation of a bag.

A Bag stores each object in the collection together with a count of occurrences. Extra methods on the interface allow multiple copies of an object to be added or removed at once. It is important to read the interface javadoc carefully as several methods violate the Collection interface specification.

Since:

3.0 (previously in main package v2.0)

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.collections4.bag.AbstractMapBag

AbstractMapBag.MutableInteger

Constructor Summary

Constructors

Constructor and Description
HashBag() Constructs an empty HashBag.
HashBag(Collection<? extends E> coll) Constructs a bag containing all the members of the given collection.

Method Summary

Methods inherited from class org.apache.commons.collections4.bag.AbstractMapBag

add, add, addAll, clear, contains, containsAll, doReadObject, doWriteObject, equals, getCount, getMap, hashCode, isEmpty, iterator, remove, remove, removeAll, retainAll, size, toArray, toArray, toString, uniqueSet

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, spliterator, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

HashBag

public HashBag()

Constructs an empty HashBag.

HashBag

public HashBag(Collection<? extends E> coll)

Constructs a bag containing all the members of the given collection.

Parameters:

coll - a collection to copy into this bag