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:
    Serializable, Iterable, Collection, Bag

      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: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $
  Author:
    Chuck Burdick, Stephen Colebourne
  See Also:
    Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.commons.collections.bag.AbstractMapBag

      `AbstractMapBag.MutableInteger`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `HashBag()` Constructs an empty `HashBag`.
    `HashBag(Collection coll)` Constructs a bag containing all the members of the given collection.

  - ### Method Summary

    - ### 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

Copyright © 2001–2015 The Apache Software Foundation. All rights reserved.