# Class AbstractHashedMap.KeySet<K>

java.lang.Object
java.util.AbstractCollection<K>
java.util.AbstractSet<K>
org.apache.commons.collections4.map.AbstractHashedMap.KeySet<K>

Type Parameters:
  `K` - the type of elements maintained by this set

All Implemented Interfaces:
  `Iterable<K>`, `Collection<K>`, `Set<K>`

Enclosing class:
  `AbstractHashedMap<K,V>`

protected static class AbstractHashedMap.KeySet<K> extends AbstractSet<K>
KeySet implementation.

Since:
  3.0

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `KeySet(AbstractHashedMap<K,?> parent)`
  Constructs a new instance.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `clear()`
  `boolean`
  `contains(Object key)`
  `Iterator<K>`
  `iterator()`
  `boolean`
  `remove(Object key)`
  `int`
  `size()`

  ### Methods inherited from class java.util.AbstractSet

  `equals, hashCode, removeAll`

  ### Methods inherited from class java.util.AbstractCollection

  `add, addAll, containsAll, isEmpty, retainAll, toArray, toArray, toString`

  ### Methods inherited from class java.lang.Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

  ### Methods inherited from interface java.util.Collection

  `parallelStream, removeIf, stream`

  ### Methods inherited from interface java.lang.Iterable

  `forEach`

  ### Methods inherited from interface java.util.Set

  `add, addAll, containsAll, isEmpty, retainAll, spliterator, toArray, toArray`

- ## Constructor Details

  - ### KeySet

    protected KeySet(AbstractHashedMap<K,?> parent)
    Constructs a new instance.
    Parameters:
      `parent` - The parent AbstractHashedMap.

- ## Method Details

  - ### clear

    public void clear()
    Specified by:
      `clear` in interface `Collection<K>`
    Specified by:
      `clear` in interface `Set<K>`
    Overrides:
      `clear` in class `AbstractCollection<K>`

  - ### contains

    public boolean contains(Object key)
    Specified by:
      `contains` in interface `Collection<K>`
    Specified by:
      `contains` in interface `Set<K>`
    Overrides:
      `contains` in class `AbstractCollection<K>`

  - ### iterator

    public Iterator<K> iterator()
    Specified by:
      `iterator` in interface `Collection<K>`
    Specified by:
      `iterator` in interface `Iterable<K>`
    Specified by:
      `iterator` in interface `Set<K>`
    Specified by:
      `iterator` in class `AbstractCollection<K>`

  - ### remove

    public boolean remove(Object key)
    Specified by:
      `remove` in interface `Collection<K>`
    Specified by:
      `remove` in interface `Set<K>`
    Overrides:
      `remove` in class `AbstractCollection<K>`

  - ### size

    public int size()
    Specified by:
      `size` in interface `Collection<K>`
    Specified by:
      `size` in interface `Set<K>`
    Specified by:
      `size` in class `AbstractCollection<K>`