org.apache.commons.collections.bag
Class HashBag

java.lang.Object
  |
  +--org.apache.commons.collections.bag.AbstractMapBag
        |
        +--org.apache.commons.collections.bag.HashBag

All Implemented Interfaces:

Bag, Collection, Serializable

public class HashBag

extends AbstractMapBag

implements Bag, 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:

Commons Collections 3.0 (previously in main package v2.0)

Version:

$Revision: 1.8 $ $Date: 2004/02/18 00:56:25 $

Author:

Chuck Burdick, Stephen Colebourne

See Also:

Serialized Form

Nested Class Summary

Nested classes inherited from class org.apache.commons.collections.bag.AbstractMapBag

AbstractMapBag.MutableInteger

Constructor Summary

HashBag()
Constructs an empty HashBag.

HashBag(Collection coll)
Constructs a bag containing all the members of the given collection.

Methods inherited from class org.apache.commons.collections.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 org.apache.commons.collections.Bag

add, add, containsAll, getCount, iterator, remove, remove, removeAll, retainAll, size, uniqueSet

Methods inherited from interface java.util.Collection

addAll, clear, contains, equals, hashCode, isEmpty, toArray, toArray

Constructor Detail

HashBag

public HashBag()

Constructs an empty HashBag.

HashBag

public HashBag(Collection coll)

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

Parameters:

coll - a collection to copy into this bag