it.unimi.dsi.fastutil.objects

Class ObjectCollections.EmptyCollection<K>

java.lang.Object

java.util.AbstractCollection<K>

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

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

All Implemented Interfaces:

ObjectCollection<K>, ObjectIterable<K>, Iterable<K>, Collection<K>

Direct Known Subclasses:

ObjectBigLists.EmptyBigList, ObjectLists.EmptyList, ObjectSets.EmptySet

Enclosing class:

ObjectCollections

public abstract static class ObjectCollections.EmptyCollection<K>
extends AbstractObjectCollection<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 and Description
boolean	add(K k)
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	remove(Object k)
int	size()
Object[]	toArray()
<T> T[]	toArray(T[] a) Returns an containing the items of this collection; the runtime type of the returned array is that of the specified array.

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

addAll, containsAll, isEmpty, objectIterator, removeAll, retainAll, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, spliterator, stream

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

add

public boolean add(K k)

Specified by:

add in interface Collection<K>

Overrides:

add in class AbstractObjectCollection<K>

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 AbstractObjectCollection<K>

remove

public boolean remove(Object k)

Specified by:

remove in interface Collection<K>

Overrides:

remove in class AbstractCollection<K>

toArray

public <T> T[] toArray(T[] a)

Description copied from interface: ObjectCollection

Returns an containing the items of this collection; the runtime type of the returned array is that of the specified array.

Warning: Note that, contrarily to Collection.toArray(Object[]), this methods just writes all elements of this collection: no special value will be added after the last one.

Specified by:

toArray in interface ObjectCollection<K>

Specified by:

toArray in interface Collection<K>

Overrides:

toArray in class AbstractObjectCollection<K>

Parameters:

a - if this array is big enough, it will be used to store this collection.

Returns:

a primitive type array containing the items of this collection.

See Also:

Collection.toArray(Object[])

iterator

public ObjectBidirectionalIterator<K> iterator()

Description copied from interface: ObjectCollection

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 ObjectCollection<K>

Specified by:

iterator in interface ObjectIterable<K>

Specified by:

iterator in interface Iterable<K>

Specified by:

iterator in interface Collection<K>

Specified by:

iterator in class AbstractObjectCollection<K>

Returns:

a type-specific iterator on the elements of this collection.

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