LongCollections.EmptyCollection (fastutil 7.0.13)

java.lang.Object
- java.util.AbstractCollection<java.lang.Long>
- - it.unimi.dsi.fastutil.longs.AbstractLongCollection
  - - it.unimi.dsi.fastutil.longs.LongCollections.EmptyCollection

All Implemented Interfaces:

LongCollection, LongIterable, java.lang.Iterable<java.lang.Long>, java.util.Collection<java.lang.Long>

Direct Known Subclasses:

LongBigLists.EmptyBigList, LongLists.EmptyList, LongSets.EmptySet

Enclosing class:

LongCollections
```
public abstract static class LongCollections.EmptyCollection
extends AbstractLongCollection
```
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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`add(long k)`
`boolean`	`addAll(LongCollection c)` Adds all elements of the given type-specific collection to this collection.
`void`	`clear()`
`boolean`	`contains(long k)`
`boolean`	`containsAll(LongCollection c)` Checks whether this collection contains all elements from the given type-specific collection.
`boolean`	`equals(java.lang.Object o)`
`int`	`hashCode()`
`LongBidirectionalIterator`	`iterator()` Returns a type-specific iterator on the elements of this collection.
`boolean`	`rem(long k)` Note that this method should be called `remove()`, but the clash with the similarly named index-based method in the `List` interface forces us to use a distinguished name.
`boolean`	`removeAll(LongCollection c)` Remove from this collection all elements in the given type-specific collection.
`boolean`	`retainAll(LongCollection c)` Retains in this collection only elements from the given type-specific collection.
`int`	`size()`
`java.lang.Object[]`	`toArray()`
`long[]`	`toLongArray()` Returns a primitive type array containing the items of this collection.
`long[]`	`toLongArray(long[] a)` Returns a primitive type array containing the items of this collection.

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongCollection
add, addAll, contains, containsAll, isEmpty, longIterator, rem, remove, removeAll, retainAll, toArray, toArray, 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(long k)
```
    Specified by:
    
    add in interface LongCollection
    
    Overrides:
    
    add in class AbstractLongCollection
    
    See Also:
    
    Collection.add(Object)
  - contains
```
public boolean contains(long k)
```
    Specified by:
    
    contains in interface LongCollection
    
    Overrides:
    
    contains in class AbstractLongCollection
    
    See Also:
    
    Collection.contains(Object)
  - toArray
```
public java.lang.Object[] toArray()
```
    Specified by:
    
    toArray in interface java.util.Collection<java.lang.Long>
    
    Overrides:
    
    toArray in class AbstractLongCollection
  - toLongArray
```
public long[] toLongArray(long[] a)
```
    Description copied from interface: LongCollection
    
    Returns a primitive type array containing the items of this collection.
    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:
    
    toLongArray in interface LongCollection
    
    Overrides:
    
    toLongArray in class AbstractLongCollection
    
    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[])
  - toLongArray
```
public long[] toLongArray()
```
    Description copied from interface: LongCollection
    
    Returns a primitive type array containing the items of this collection.
    
    Specified by:
    
    toLongArray in interface LongCollection
    
    Overrides:
    
    toLongArray in class AbstractLongCollection
    
    Returns:
    
    a primitive type array containing the items of this collection.
    
    See Also:
    
    Collection.toArray()
  - rem
```
public boolean rem(long k)
```
    Description copied from interface: LongCollection
    
    Note that this method should be called remove(), but the clash with the similarly named index-based method in the List interface forces us to use a distinguished name. For simplicity, the set interfaces reinstates remove().
    
    Specified by:
    
    rem in interface LongCollection
    
    Overrides:
    
    rem in class AbstractLongCollection
    
    See Also:
    
    Collection.remove(Object)
  - addAll
```
public boolean addAll(LongCollection c)
```
    Description copied from class: AbstractLongCollection
    
    Adds all elements of the given type-specific collection to this collection.
    
    Specified by:
    
    addAll in interface LongCollection
    
    Overrides:
    
    addAll in class AbstractLongCollection
    
    Parameters:
    
    c - a type-specific collection.
    
    Returns:
    
    true if this collection changed as a result of the call.
    
    See Also:
    
    Collection.addAll(Collection)
  - removeAll
```
public boolean removeAll(LongCollection c)
```
    Description copied from class: AbstractLongCollection
    
    Remove from this collection all elements in the given type-specific collection.
    
    Specified by:
    
    removeAll in interface LongCollection
    
    Overrides:
    
    removeAll in class AbstractLongCollection
    
    Parameters:
    
    c - a type-specific collection.
    
    Returns:
    
    true if this collection changed as a result of the call.
    
    See Also:
    
    Collection.removeAll(Collection)
  - retainAll
```
public boolean retainAll(LongCollection c)
```
    Description copied from class: AbstractLongCollection
    
    Retains in this collection only elements from the given type-specific collection.
    
    Specified by:
    
    retainAll in interface LongCollection
    
    Overrides:
    
    retainAll in class AbstractLongCollection
    
    Parameters:
    
    c - a type-specific collection.
    
    Returns:
    
    true if this collection changed as a result of the call.
    
    See Also:
    
    Collection.retainAll(Collection)
  - containsAll
```
public boolean containsAll(LongCollection c)
```
    Description copied from class: AbstractLongCollection
    
    Checks whether this collection contains all elements from the given type-specific collection.
    
    Specified by:
    
    containsAll in interface LongCollection
    
    Overrides:
    
    containsAll in class AbstractLongCollection
    
    Parameters:
    
    c - a type-specific collection.
    
    Returns:
    
    true if this collection contains all elements of the argument.
    
    See Also:
    
    Collection.containsAll(Collection)
  - iterator
```
public LongBidirectionalIterator iterator()
```
    Description copied from interface: LongCollection
    
    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 LongCollection
    
    Specified by:
    
    iterator in interface LongIterable
    
    Specified by:
    
    iterator in interface java.lang.Iterable<java.lang.Long>
    
    Specified by:
    
    iterator in interface java.util.Collection<java.lang.Long>
    
    Specified by:
    
    iterator in class AbstractLongCollection
    
    Returns:
    
    a type-specific iterator on the elements of this collection.
  - size
```
public int size()
```
    Specified by:
    
    size in interface java.util.Collection<java.lang.Long>
    
    Specified by:
    
    size in class java.util.AbstractCollection<java.lang.Long>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface java.util.Collection<java.lang.Long>
    
    Overrides:
    
    clear in class java.util.AbstractCollection<java.lang.Long>
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface java.util.Collection<java.lang.Long>
    
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object o)
```
    Specified by:
    
    equals in interface java.util.Collection<java.lang.Long>
    
    Overrides:
    
    equals in class java.lang.Object

Class LongCollections.EmptyCollection

Method Summary

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongCollection

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Method Detail

add

contains

toArray

toLongArray

toLongArray

rem

addAll

removeAll

retainAll

containsAll

iterator

size

clear

hashCode

equals