it.unimi.dsi.fastutil.objects.ReferenceCollections.EmptyCollection<K>

All Implemented Interfaces:: ObjectIterable<K>, ReferenceCollection<K>, Iterable<K>, Collection<K>

Direct Known Subclasses:: ReferenceBigLists.EmptyBigList, ReferenceLists.EmptyList, ReferenceSets.EmptySet

Enclosing class:: ReferenceCollections

public abstract static class ReferenceCollections.EmptyCollection<K>
extends AbstractReferenceCollection<K>

An immutable class representing an empty type-specific collection.

This class may be useful to implement your own in case you subclass a type-specific collection.

Method Summary

Modifier and Type	Method	Description
`boolean`	`addAll(Collection<? extends K> c)`
`void`	`clear()`
`boolean`	`contains(Object k)`
`boolean`	`equals(Object o)`
`int`	`hashCode()`
`ObjectBidirectionalIterator<K>`	`iterator()`	Returns a type-specific iterator on the elements of this collection.
`boolean`	`removeAll(Collection<?> c)`
`boolean`	`retainAll(Collection<?> c)`
`int`	`size()`
`Object[]`	`toArray()`

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReferenceCollection

toString

Methods inherited from class java.util.AbstractCollection

add, containsAll, isEmpty, remove, toArray

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

add, containsAll, isEmpty, parallelStream, remove, removeIf, spliterator, stream, toArray, toArray

Methods inherited from interface java.lang.Iterable

forEach

Method Details
- contains
  
  public boolean contains(Object k)
  
  Specified by:
  
  contains in interface Collection<K>
  
  Overrides:
  
  contains in class AbstractCollection<K>
- toArray
  
  public Object[] toArray()
  
  Specified by:
  
  toArray in interface Collection<K>
  
  Overrides:
  
  toArray in class AbstractCollection<K>
- iterator
  
  public ObjectBidirectionalIterator<K> iterator()
  
  Description copied from interface: ReferenceCollection
  
  Returns a type-specific iterator on the elements of this collection.
  Note that this specification strengthens the one given in Iterable.iterator(), which was already strengthened in the corresponding type-specific class, but was weakened by the fact that this interface extends Collection.
  
  Specified by:
  
  iterator in interface Collection<K>
  
  Specified by:
  
  iterator in interface Iterable<K>
  
  Specified by:
  
  iterator in interface ObjectIterable<K>
  
  Specified by:
  
  iterator in interface ReferenceCollection<K>
  
  Specified by:
  
  iterator in class AbstractReferenceCollection<K>
  
  Returns:
  
  a type-specific iterator on the elements of this collection.
  
  See Also:
  
  Iterable.iterator()
- size
  
  public int size()
  
  Specified by:
  
  size in interface Collection<K>
  
  Specified by:
  
  size in class AbstractCollection<K>
- clear
  
  public void clear()
  
  Specified by:
  
  clear in interface Collection<K>
  
  Overrides:
  
  clear in class AbstractCollection<K>
- hashCode
  
  public int hashCode()
  
  Specified by:
  
  hashCode in interface Collection<K>
  
  Overrides:
  
  hashCode in class Object
- equals
  
  public boolean equals(Object o)
  
  Specified by:
  
  equals in interface Collection<K>
  
  Overrides:
  
  equals in class Object
- addAll
  
  public boolean addAll(Collection<? extends K> c)
  
  Specified by:
  
  addAll in interface Collection<K>
  
  Overrides:
  
  addAll in class AbstractCollection<K>
- removeAll
  
  public boolean removeAll(Collection<?> c)
  
  Specified by:
  
  removeAll in interface Collection<K>
  
  Overrides:
  
  removeAll in class AbstractCollection<K>
- retainAll
  
  public boolean retainAll(Collection<?> c)
  
  Specified by:
  
  retainAll in interface Collection<K>
  
  Overrides:
  
  retainAll in class AbstractCollection<K>