java.util

Class LinkedHashSet<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

java.util.HashSet<E>

java.util.LinkedHashSet<E>

All Implemented Interfaces:

Iterable<E>, Collection<E>, Set<E>

public class LinkedHashSet<E>
extends HashSet<E>
implements Set<E>

LinkedHashSet is a variant of HashSet. Its entries are kept in a doubly-linked list. The iteration order is the order in which entries were inserted.

Null elements are allowed, and all the optional Set operations are supported.

Like HashSet, LinkedHashSet is not thread safe, so access by multiple threads must be synchronized by an external mechanism such as Collections.synchronizedSet(Set).

Since:

1.4

Constructor Summary

Constructors

Constructor and Description
LinkedHashSet() Constructs a new empty instance of LinkedHashSet.
LinkedHashSet(Collection<? extends E> collection) Constructs a new instance of LinkedHashSet containing the unique elements in the specified collection.
LinkedHashSet(int capacity) Constructs a new instance of LinkedHashSet with the specified capacity.
LinkedHashSet(int capacity, float loadFactor) Constructs a new instance of LinkedHashSet with the specified capacity and load factor.

Method Summary

Methods inherited from class java.util.HashSet

add, clear, contains, isEmpty, iterator, remove, size

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray

Constructor Detail

LinkedHashSet

public LinkedHashSet()

Constructs a new empty instance of LinkedHashSet.

LinkedHashSet

public LinkedHashSet(int capacity)

Constructs a new instance of LinkedHashSet with the specified capacity.

Parameters:

capacity - the initial capacity of this LinkedHashSet.

LinkedHashSet

public LinkedHashSet(int capacity,
                     float loadFactor)

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

Parameters:

capacity - the initial capacity.

loadFactor - the initial load factor.

LinkedHashSet

public LinkedHashSet(Collection<? extends E> collection)

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

Parameters:

collection - the collection of elements to add.