Package it.unimi.dsi.fastutil.objects

Class ReferenceCollections.EmptyCollection<K>

java.lang.Object

java.util.AbstractCollection<K>

it.unimi.dsi.fastutil.objects.AbstractReferenceCollection<K>

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 Detail

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>