sdd

Class Singleton<X>

java.lang.Object

sdd.Singleton<X>

Type Parameters:

X - the type of object in this singleton.

All Implemented Interfaces:

java.lang.Iterable<X>, java.util.Collection<X>, java.util.Set<X>

public final class Singleton<X>
extends java.lang.Object
implements java.util.Set<X>

A Singleton, i.e., a singleton, is an unmodifiable set that contains only one element.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	UNMODIFIABLE_MESSAGE The (string) message that indicates that the set cannot be modified.

Constructor Summary

Constructors

Constructor and Description
Singleton(X x) Builds the singleton that contains the specified element.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(X e)
boolean	addAll(java.util.Collection<? extends X> c)
void	clear()
boolean	contains(java.lang.Object o)
boolean	containsAll(java.util.Collection<?> c)
boolean	isEmpty()
java.util.Iterator<X>	iterator()
boolean	remove(java.lang.Object o)
boolean	removeAll(java.util.Collection<?> c)
boolean	retainAll(java.util.Collection<?> c)
int	size()
java.lang.Object[]	toArray()
<T> T[]	toArray(T[] a)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Set

equals, hashCode

Field Detail

UNMODIFIABLE_MESSAGE

public static final java.lang.String UNMODIFIABLE_MESSAGE

The (string) message that indicates that the set cannot be modified.

See Also:

Constant Field Values

Constructor Detail

Singleton

public Singleton(X x)

Builds the singleton that contains the specified element.

Parameters:

x - the element in this singleton.

Method Detail

size

public int size()

Specified by:

size in interface java.util.Collection<X>

Specified by:

size in interface java.util.Set<X>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection<X>

Specified by:

isEmpty in interface java.util.Set<X>

contains

public boolean contains(java.lang.Object o)

Specified by:

contains in interface java.util.Collection<X>

Specified by:

contains in interface java.util.Set<X>

iterator

public java.util.Iterator<X> iterator()

Specified by:

iterator in interface java.lang.Iterable<X>

Specified by:

iterator in interface java.util.Collection<X>

Specified by:

iterator in interface java.util.Set<X>

toArray

public java.lang.Object[] toArray()

Specified by:

toArray in interface java.util.Collection<X>

Specified by:

toArray in interface java.util.Set<X>

toArray

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

Specified by:

toArray in interface java.util.Collection<X>

Specified by:

toArray in interface java.util.Set<X>

add

public boolean add(X e)

Specified by:

add in interface java.util.Collection<X>

Specified by:

add in interface java.util.Set<X>

remove

public boolean remove(java.lang.Object o)

Specified by:

remove in interface java.util.Collection<X>

Specified by:

remove in interface java.util.Set<X>

containsAll

public boolean containsAll(java.util.Collection<?> c)

Specified by:

containsAll in interface java.util.Collection<X>

Specified by:

containsAll in interface java.util.Set<X>

addAll

public boolean addAll(java.util.Collection<? extends X> c)

Specified by:

addAll in interface java.util.Collection<X>

Specified by:

addAll in interface java.util.Set<X>

retainAll

public boolean retainAll(java.util.Collection<?> c)

Specified by:

retainAll in interface java.util.Collection<X>

Specified by:

retainAll in interface java.util.Set<X>

removeAll

public boolean removeAll(java.util.Collection<?> c)

Specified by:

removeAll in interface java.util.Collection<X>

Specified by:

removeAll in interface java.util.Set<X>

clear

public void clear()

Specified by:

clear in interface java.util.Collection<X>

Specified by:

clear in interface java.util.Set<X>