oracle.adfnmc.java.util
Class HashSet

java.lang.Object
  oracle.adfnmc.java.util.AbstractCollection
      oracle.adfnmc.java.util.AbstractSet
          oracle.adfnmc.java.util.HashSet

All Implemented Interfaces:

Serializable, Cloneable, Iterable, Collection, Set

public class HashSet
extends AbstractSet
implements Set, Cloneable, Serializable

HashSet is an implementation of Set. All optional operations are supported, adding and removing. The elements can be any objects.

Constructor Summary

HashSet()
Constructs a new empty instance of HashSet.

HashSet(Collection collection)
Constructs a new instance of HashSet containing the unique elements in the specified collection.

HashSet(int capacity)
Constructs a new instance of HashSet with the specified capacity.

HashSet(int capacity, float loadFactor)
Constructs a new instance of HashSet with the specified capacity and load factor.

Method Summary

boolean	add(java.lang.Object object) Adds the specified object to this HashSet.
void	clear() Removes all elements from this HashSet, leaving it empty.
java.lang.Object	clone() Answers a new HashSet with the same elements and size as this HashSet.
boolean	contains(java.lang.Object object) Searches this HashSet for the specified object.
boolean	isEmpty() Answers if this HashSet has no elements, a size of zero.
Iterator	iterator() Answers an Iterator on the elements of this HashSet.
boolean	remove(java.lang.Object object) Removes an occurrence of the specified object from this HashSet.
int	size() Answers the number of elements in this HashSet.

Methods inherited from class oracle.adfnmc.java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class oracle.adfnmc.java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface oracle.adfnmc.java.util.Set

addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray

Constructor Detail

HashSet

public HashSet()

Constructs a new empty instance of HashSet.

HashSet

public HashSet(int capacity)

Constructs a new instance of HashSet with the specified capacity.

Parameters:

capacity - the initial capacity of this HashSet

HashSet

public HashSet(int capacity,
               float loadFactor)

Constructs a new instance of HashSet with the specified capacity and load factor.

Parameters:

capacity - the initial capacity

loadFactor - the initial load factor

HashSet

public HashSet(Collection collection)

Constructs a new instance of HashSet containing the unique elements in the specified collection.

Parameters:

collection - the collection of elements to add

Method Detail

add

public boolean add(java.lang.Object object)

Adds the specified object to this HashSet.

Specified by:

add in interface Collection

Specified by:

add in interface Set

Overrides:

add in class AbstractCollection

Parameters:

object - the object to add

Returns:

true when this HashSet did not already contain the object, false otherwise

clear

public void clear()

Removes all elements from this HashSet, leaving it empty.

Specified by:

clear in interface Collection

Specified by:

clear in interface Set

Overrides:

clear in class AbstractCollection

See Also:

isEmpty(), size()

clone

public java.lang.Object clone()

Answers a new HashSet with the same elements and size as this HashSet.

Returns:

a shallow copy of this HashSet

See Also:

Cloneable

contains

public boolean contains(java.lang.Object object)

Searches this HashSet for the specified object.

Specified by:

contains in interface Collection

Specified by:

contains in interface Set

Overrides:

contains in class AbstractCollection

Parameters:

object - the object to search for

Returns:

true if object is an element of this HashSet, false otherwise

isEmpty

public boolean isEmpty()

Answers if this HashSet has no elements, a size of zero.

Specified by:

isEmpty in interface Collection

Specified by:

isEmpty in interface Set

Overrides:

isEmpty in class AbstractCollection

Returns:

true if this HashSet has no elements, false otherwise

See Also:

size()

iterator

public Iterator iterator()

Answers an Iterator on the elements of this HashSet.

Specified by:

iterator in interface Iterable

Specified by:

iterator in interface Collection

Specified by:

iterator in interface Set

Specified by:

iterator in class AbstractCollection

Returns:

an Iterator on the elements of this HashSet

See Also:

Iterator

remove

public boolean remove(java.lang.Object object)

Removes an occurrence of the specified object from this HashSet.

Specified by:

remove in interface Collection

Specified by:

remove in interface Set

Overrides:

remove in class AbstractCollection

Parameters:

object - the object to remove

Returns:

true if this HashSet is modified, false otherwise

size

public int size()

Answers the number of elements in this HashSet.

Specified by:

size in interface Collection

Specified by:

size in interface Set

Specified by:

size in class AbstractCollection

Returns:

the number of elements in this HashSet