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>
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:
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Nested Class Summary
Nested classes/interfaces inherited from class org.apache.commons.collections4.bag.AbstractMapBag
AbstractMapBag.BagIterator<E>, AbstractMapBag.MutableInteger
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Field Summary
Fields -
Constructor Summary
ConstructorsConstructorDescriptionHashBag()
Constructs an emptyHashBag
.HashBag
(Collection<? extends E> coll) Constructs a bag containing all the members of the given collection. -
Method Summary
Modifier and TypeMethodDescriptionprivate void
Read the bag in using a custom routine.private void
Write the bag out using a custom routine.Methods inherited from class org.apache.commons.collections4.bag.AbstractMapBag
add, add, addAll, clear, contains, containsAll, containsAll, doReadObject, doWriteObject, equals, getCount, getMap, hashCode, isEmpty, iterator, remove, remove, removeAll, retainAll, 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
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Field Details
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serialVersionUID
private static final long serialVersionUIDSerial version lock- See Also:
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Constructor Details
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HashBag
public HashBag()Constructs an emptyHashBag
. -
HashBag
Constructs a bag containing all the members of the given collection.- Parameters:
coll
- a collection to copy into this bag
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Method Details
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writeObject
Write the bag out using a custom routine.- Parameters:
out
- the output stream- Throws:
IOException
- if an error occurs while writing to the stream
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readObject
Read the bag in using a custom routine.- Parameters:
in
- the input stream- Throws:
IOException
- if an error occurs while reading from the streamClassNotFoundException
- if an object read from the stream can not be loaded
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