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java.util
Class Collections.SingletonSet  

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractSet
          java.util.Collections.SingletonSet

All Implemented Interfaces:

Collection, java.lang.Iterable, java.io.Serializable, Set

Enclosing class:

Collections

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private static final class Collections.SingletonSet

extends AbstractSet

implements java.io.Serializable

The implementation of Collections.singleton(Object) 55 . This class name is required for compatibility with Sun's JDK serializability.

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Field Summary
(package private)  java.lang.Object	element           The single element; package visible for use in nested class.
private static long	serialVersionUID           Compatible with JDK 1.4.

 

Constructor Summary
(package private)	Collections.SingletonSet(java.lang.Object o)           Construct a singleton.

 

Method Summary
boolean	contains(java.lang.Object o)           The set only contains one element.
boolean	containsAll(Collection c)           This is true if the other collection only contains the element.
int	hashCode()           The hash is just that of the element.
Iterator	iterator()           Returns an iterator over the lone element.
int	size()           The size: always 1!
java.lang.Object[]	toArray()           Returning an array is simple.
java.lang.String	toString()           Obvious string.

 

Methods inherited from class java.util.AbstractSet

equals, removeAll

 

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, equals, hashCode, isEmpty, remove, removeAllInternal, retainAll, retainAllInternal, toArray

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Methods inherited from interface java.util.Set

add, addAll, clear, isEmpty, remove, retainAll, toArray

 

Field Detail

serialVersionUID

private static final long serialVersionUID

Compatible with JDK 1.4.

See Also:

Constant Field Values

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element

final java.lang.Object element

The single element; package visible for use in nested class.

Constructor Detail

Collections.SingletonSet

Collections.SingletonSet(java.lang.Object o)

Construct a singleton.

Method Detail

size

public int size()

The size: always 1!

Specified by:

size in interface Set

Specified by:

size in class AbstractCollection

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iterator

public Iterator iterator()

Returns an iterator over the lone element.

Specified by:

iterator in interface Set

Specified by:

iterator in class AbstractCollection

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contains

public boolean contains(java.lang.Object o)

The set only contains one element.

Specified by:

contains in interface Set

Overrides:

contains in class AbstractCollection

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containsAll

public boolean containsAll(Collection c)

This is true if the other collection only contains the element.

Specified by:

containsAll in interface Set

Overrides:

containsAll in class AbstractCollection

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hashCode

public int hashCode()

The hash is just that of the element.

Specified by:

hashCode in interface Set

Overrides:

hashCode in class AbstractSet

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toArray

public java.lang.Object[] toArray()

Returning an array is simple.

Specified by:

toArray in interface Set

Overrides:

toArray in class AbstractCollection

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toString

public java.lang.String toString()

Obvious string.

Overrides:

toString in class AbstractCollection

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