HashBag (Commons Collections 3.2.2 API)

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 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, parallelStream, removeIf, spliterator, stream, toArray, toArray, toArray
  - Methods inherited from interface java.lang.Iterable
    forEach

- 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