ConcurrentHashMapV8.KeySetView (jsr166e 1.0 API)

java.lang.Object
- jsr166e.ConcurrentHashMapV8.KeySetView<K,V>

All Implemented Interfaces:

Serializable, Iterable<K>, Collection<K>, Set<K>

Enclosing class:

ConcurrentHashMapV8<K,V>
```
public static class ConcurrentHashMapV8.KeySetView<K,V>
extends Object
implements Set<K>, Serializable
```
A view of a ConcurrentHashMapV8 as a Set of keys, in which additions may optionally be enabled by mapping to a common value. This class cannot be directly instantiated. See keySet(), keySet(V), newKeySet(), newKeySet(int).

Since:

1.8

See Also:
Serialized Form

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`add(K e)` Adds the specified key to this set view by mapping the key to the default mapped value in the backing map, if defined.
`boolean`	`addAll(Collection<? extends K> c)` Adds all of the elements in the specified collection to this set, as if by calling `add(K)` on each one.
`void`	`clear()` Removes all of the elements from this view, by removing all the mappings from the map backing this view.
`boolean`	`contains(Object o)`
`boolean`	`containsAll(Collection<?> c)`
`boolean`	`equals(Object o)`
`void`	`forEach(ConcurrentHashMapV8.Action<? super K> action)`
`ConcurrentHashMapV8<K,V>`	`getMap()` Returns the map backing this view.
`V`	`getMappedValue()` Returns the default mapped value for additions, or `null` if additions are not supported.
`int`	`hashCode()`
`boolean`	`isEmpty()`
`Iterator<K>`	`iterator()` Returns a "weakly consistent" iterator that will never throw `ConcurrentModificationException`, and guarantees to traverse elements as they existed upon construction of the iterator, and may (but is not guaranteed to) reflect any modifications subsequent to construction.
`boolean`	`remove(Object o)` Removes the key from this map view, by removing the key (and its corresponding value) from the backing map.
`boolean`	`removeAll(Collection<?> c)`
`boolean`	`retainAll(Collection<?> c)`
`int`	`size()`
`ConcurrentHashMapV8.ConcurrentHashMapSpliterator<K>`	`spliterator()`
`Object[]`	`toArray()`
`<T> T[]`	`toArray(T[] a)`
`String`	`toString()` Returns a string representation of this collection.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set
clear, containsAll, isEmpty, removeAll, retainAll, size, toArray, toArray

- Method Detail
  - getMappedValue
```
public V getMappedValue()
```
    Returns the default mapped value for additions, or null if additions are not supported.
    
    Returns:
    the default mapped value for additions, or null if not supported
  - contains
```
public boolean contains(Object o)
```
    Specified by:
    
    contains in interface Collection<K>
    
    Specified by:
    
    contains in interface Set<K>
    
    Throws:
    
    NullPointerException - if the specified key is null
  - remove
```
public boolean remove(Object o)
```
    Removes the key from this map view, by removing the key (and its corresponding value) from the backing map. This method does nothing if the key is not in the map.
    
    Specified by:
    
    remove in interface Collection<K>
    
    Specified by:
    
    remove in interface Set<K>
    
    Parameters:
    o - the key to be removed from the backing map
    
    Returns:
    true if the backing map contained the specified key
    
    Throws:
    
    NullPointerException - if the specified key is null
  - iterator
```
public Iterator<K> iterator()
```
    Returns a "weakly consistent" iterator that will never throw ConcurrentModificationException, and guarantees to traverse elements as they existed upon construction of the iterator, and may (but is not guaranteed to) reflect any modifications subsequent to construction.
    
    Specified by:
    
    iterator in interface Iterable<K>
    
    Specified by:
    
    iterator in interface Collection<K>
    
    Specified by:
    
    iterator in interface Set<K>
    
    Returns:
    an iterator over the keys of the backing map
  - add
```
public boolean add(K e)
```
    Adds the specified key to this set view by mapping the key to the default mapped value in the backing map, if defined.
    
    Specified by:
    
    add in interface Collection<K>
    
    Specified by:
    
    add in interface Set<K>
    
    Parameters:
    e - key to be added
    
    Returns:
    true if this set changed as a result of the call
    
    Throws:
    
    NullPointerException - if the specified key is null
    
    UnsupportedOperationException - if no default mapped value for additions was provided
  - addAll
```
public boolean addAll(Collection<? extends K> c)
```
    Adds all of the elements in the specified collection to this set, as if by calling add(K) on each one.
    
    Specified by:
    
    addAll in interface Collection<K>
    
    Specified by:
    
    addAll in interface Set<K>
    
    Parameters:
    c - the elements to be inserted into this set
    
    Returns:
    true if this set changed as a result of the call
    
    Throws:
    
    NullPointerException - if the collection or any of its elements are null
    
    UnsupportedOperationException - if no default mapped value for additions was provided
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Collection<K>
    
    Specified by:
    
    hashCode in interface Set<K>
    
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object o)
```
    Specified by:
    
    equals in interface Collection<K>
    
    Specified by:
    
    equals in interface Set<K>
    
    Overrides:
    
    equals in class Object
  - spliterator
```
public ConcurrentHashMapV8.ConcurrentHashMapSpliterator<K> spliterator()
```
  - forEach
```
public void forEach(ConcurrentHashMapV8.Action<? super K> action)
```
  - getMap
```
public ConcurrentHashMapV8<K,V> getMap()
```
    Returns the map backing this view.
    
    Returns:
    the map backing this view
  - clear
```
public final void clear()
```
    Removes all of the elements from this view, by removing all the mappings from the map backing this view.
    
    Specified by:
    
    clear in interface Collection<E>
  - size
```
public final int size()
```
    Specified by:
    
    size in interface Collection<E>
  - isEmpty
```
public final boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Collection<E>
  - toArray
```
public final Object[] toArray()
```
    Specified by:
    
    toArray in interface Collection<E>
  - toArray
```
public final <T> T[] toArray(T[] a)
```
    Specified by:
    
    toArray in interface Collection<E>
  - toString
```
public final String toString()
```
    Returns a string representation of this collection. The string representation consists of the string representations of the collection's elements in the order they are returned by its iterator, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (comma and space). Elements are converted to strings as by String.valueOf(Object).
    
    Overrides:
    
    toString in class Object
    
    Returns:
    a string representation of this collection
  - containsAll
```
public final boolean containsAll(Collection<?> c)
```
    Specified by:
    
    containsAll in interface Collection<E>
  - removeAll
```
public final boolean removeAll(Collection<?> c)
```
    Specified by:
    
    removeAll in interface Collection<E>
  - retainAll
```
public final boolean retainAll(Collection<?> c)
```
    Specified by:
    
    retainAll in interface Collection<E>

Class ConcurrentHashMapV8.KeySetView<K,V>

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Set

Method Detail

getMappedValue

contains

remove

iterator

add

addAll

hashCode

equals

spliterator

forEach

getMap

clear

size

isEmpty

toArray

toArray

toString

containsAll

removeAll

retainAll