Package 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:

  • Constructor Details

    • 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