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

java.lang.Object
  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:

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

boolean	add(K k)
void	clear()
boolean	contains(Object k)
boolean	equals(Object o)
int	hashCode()
ObjectListIterator<K>	iterator() Returns a type-specific iterator on the elements of this collection.
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, remove, removeAll, retainAll, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

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)

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<K>

Overrides:

toArray in class AbstractObjectCollection<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 ObjectListIterator<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()

clear

public void clear()

Specified by:

clear in interface Collection<K>

Overrides:

clear in class AbstractObjectCollection<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