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java.util
Class Collections.SingletonMap  

java.lang.Object
  java.util.AbstractMap
      java.util.Collections.SingletonMap

All Implemented Interfaces:

Map, java.io.Serializable

Enclosing class:

Collections

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private static final class Collections.SingletonMap

extends AbstractMap

implements java.io.Serializable

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

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Nested Class Summary

 

Nested classes inherited from class java.util.AbstractMap

AbstractMap.BasicMapEntry

 

Nested classes inherited from class java.util.Map

Map.Entry

 

Field Summary
private  Set	entries           Cache the entry set.
private  java.lang.Object	k           The single key.
private static long	serialVersionUID           Compatible with JDK 1.4.
private  java.lang.Object	v           The corresponding value.

 

Fields inherited from class java.util.AbstractMap

ENTRIES, keys, KEYS, values, VALUES

 

Constructor Summary
(package private)	Collections.SingletonMap(java.lang.Object key, java.lang.Object value)           Construct a singleton.

 

Method Summary
boolean	containsKey(java.lang.Object key)           Single entry.
boolean	containsValue(java.lang.Object value)           Single entry.
Set	entrySet()           There is a single immutable entry.
java.lang.Object	get(java.lang.Object key)           Single entry.
int	hashCode()           Calculate the hashcode directly.
Set	keySet()           Return the keyset.
int	size()           The size: always 1!
java.lang.String	toString()           Obvious string.
Collection	values()           Return the values.

 

Methods inherited from class java.util.AbstractMap

clear, clone, equals, equals, hashCode, isEmpty, put, putAll, remove

 

Methods inherited from class java.lang.Object

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

 

Field Detail

serialVersionUID

private static final long serialVersionUID

Compatible with JDK 1.4.

See Also:

Constant Field Values

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k

private final java.lang.Object k

The single key.

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v

private final java.lang.Object v

The corresponding value.

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entries

private transient Set entries

Cache the entry set.

Constructor Detail

Collections.SingletonMap

Collections.SingletonMap(java.lang.Object key,
                         java.lang.Object value)

Construct a singleton.

Method Detail

entrySet

public Set entrySet()

There is a single immutable entry.

Specified by:

entrySet in interface Map

Specified by:

entrySet in class AbstractMap

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containsKey

public boolean containsKey(java.lang.Object key)

Single entry.

Specified by:

containsKey in interface Map

Overrides:

containsKey in class AbstractMap

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containsValue

public boolean containsValue(java.lang.Object value)

Single entry.

Specified by:

containsValue in interface Map

Overrides:

containsValue in class AbstractMap

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get

public java.lang.Object get(java.lang.Object key)

Single entry.

Specified by:

get in interface Map

Overrides:

get in class AbstractMap

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hashCode

public int hashCode()

Calculate the hashcode directly.

Specified by:

hashCode in interface Map

Overrides:

hashCode in class AbstractMap

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keySet

public Set keySet()

Return the keyset.

Specified by:

keySet in interface Map

Overrides:

keySet in class AbstractMap

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size

public int size()

The size: always 1!

Specified by:

size in interface Map

Overrides:

size in class AbstractMap

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values

public Collection values()

Return the values. Technically, a singleton, while more specific than a general Collection, will work. Besides, that's what the JDK uses!

Specified by:

values in interface Map

Overrides:

values in class AbstractMap

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toString

public java.lang.String toString()

Obvious string.

Overrides:

toString in class AbstractMap

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Home >> All >> java >> [ util overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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