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## org.jivesoftware.util
Class ConcurrentHashSet<E>

    java.lang.Object
      java.util.AbstractCollection<E>
          java.util.AbstractSet<E>
              org.jivesoftware.util.ConcurrentHashSet<E>

All Implemented Interfaces:
  Serializable, Cloneable, Iterable<E>, Collection<E>, Set<E>

    public class ConcurrentHashSet<E>

extends AbstractSet<E>
implements Set<E>, Cloneable, Serializable

This class implements the `Set` interface, backed by a ConcurrentHashMap instance.

Author:
  Matt Tucker
See Also:
  Serialized Form

Constructor Summary
`ConcurrentHashSet()` Constructs a new, empty set; the backing `ConcurrentHashMap` instance has default initial capacity (16) and load factor (0.75).
`ConcurrentHashSet(Collection<? extends E> c)` Constructs a new set containing the elements in the specified collection.
`ConcurrentHashSet(int initialCapacity)` Constructs a new, empty set; the backing `HashMap` instance has the specified initial capacity and default load factor, which is `0.75`.
`ConcurrentHashSet(int initialCapacity, float loadFactor)` Constructs a new, empty set; the backing `ConcurrentHashMap` instance has the specified initial capacity and the specified load factor.

Method Summary
`boolean` | `add(E o)`
`void` | `clear()`
`Object` | `clone()`
`boolean` | `contains(Object o)`
`boolean` | `isEmpty()`
`Iterator<E>` | `iterator()`
`boolean` | `remove(Object o)`
`int` | `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
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Set
`addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray`

Constructor Detail

### ConcurrentHashSet

    public ConcurrentHashSet()

  Constructs a new, empty set; the backing `ConcurrentHashMap` instance has default initial capacity (16) and load factor (0.75).

### ConcurrentHashSet

    public ConcurrentHashSet(Collection<? extends E> c)

  Constructs a new set containing the elements in the specified collection. The `ConcurrentHashMap` is created with default load factor (0.75) and an initial capacity sufficient to contain the elements in the specified collection.

  Parameters:
    `c` - the collection whose elements are to be placed into this set.
  Throws:
    `NullPointerException` - if the specified collection is null.

### ConcurrentHashSet

    public ConcurrentHashSet(int initialCapacity,
                             float loadFactor)

  Constructs a new, empty set; the backing `ConcurrentHashMap` instance has the specified initial capacity and the specified load factor.

  Parameters:
    `initialCapacity` - the initial capacity of the hash map.
    `loadFactor` - the load factor of the hash map.
  Throws:
    `IllegalArgumentException` - if the initial capacity is less than zero, or if the load factor is nonpositive.

### ConcurrentHashSet

    public ConcurrentHashSet(int initialCapacity)

  Constructs a new, empty set; the backing `HashMap` instance has the specified initial capacity and default load factor, which is `0.75`.

  Parameters:
    `initialCapacity` - the initial capacity of the hash table.
  Throws:
    `IllegalArgumentException` - if the initial capacity is less than zero.

Method Detail

### iterator

    public Iterator<E> iterator()

  Specified by:
    `iterator` in interface `Iterable<E>`
  Specified by:
    `iterator` in interface `Collection<E>`
  Specified by:
    `iterator` in interface `Set<E>`
  Specified by:
    `iterator` in class `AbstractCollection<E>`

### size

    public int size()

  Specified by:
    `size` in interface `Collection<E>`
  Specified by:
    `size` in interface `Set<E>`
  Specified by:
    `size` in class `AbstractCollection<E>`

### isEmpty

    public boolean isEmpty()

  Specified by:
    `isEmpty` in interface `Collection<E>`
  Specified by:
    `isEmpty` in interface `Set<E>`
  Overrides:
    `isEmpty` in class `AbstractCollection<E>`

### contains

    public boolean contains(Object o)

  Specified by:
    `contains` in interface `Collection<E>`
  Specified by:
    `contains` in interface `Set<E>`
  Overrides:
    `contains` in class `AbstractCollection<E>`

### add

    public boolean add(E o)

  Specified by:
    `add` in interface `Collection<E>`
  Specified by:
    `add` in interface `Set<E>`
  Overrides:
    `add` in class `AbstractCollection<E>`

### remove

    public boolean remove(Object o)

  Specified by:
    `remove` in interface `Collection<E>`
  Specified by:
    `remove` in interface `Set<E>`
  Overrides:
    `remove` in class `AbstractCollection<E>`

### clear

    public void clear()

  Specified by:
    `clear` in interface `Collection<E>`
  Specified by:
    `clear` in interface `Set<E>`
  Overrides:
    `clear` in class `AbstractCollection<E>`

### clone

    public Object clone()

  Overrides:
    `clone` in class `Object`

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