java.util

Class IdentityHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.IdentityHashMap<K,V>

Type Parameters:

K - key type

V - value type

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class IdentityHashMap<K,V>
extends AbstractMap<K,V>
implements Map<K,V>, Cloneable, Serializable

Map using reference equality on keys. [Sun docs]

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
IdentityHashMap()
IdentityHashMap(int ignored)
IdentityHashMap(Map<? extends K,? extends V> toBeCopied)

Method Summary

Modifier and Type	Method and Description
void	clear()
Object	clone()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
boolean	equals(Object obj)
V	get(Object key)
protected V	getStringValue(String key) Returns the value for the given key in the stringMap.
int	hashCode()
protected boolean	hasStringValue(String key) Returns true if the given key exists in the stringMap.
V	put(K key, V value)
protected V	putStringValue(String key, V value) Sets the specified key to the specified value in the stringMap.
V	remove(Object key)
protected V	removeStringValue(String key) Removes the specified key from the stringMap and returns the value that was previously there.
int	size()

Methods inherited from class java.util.AbstractMap

isEmpty, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

finalize, getClass

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, entrySet, get, isEmpty, keySet, put, putAll, remove, size, values

Constructor Detail

IdentityHashMap

public IdentityHashMap()

IdentityHashMap

public IdentityHashMap(int ignored)

IdentityHashMap

public IdentityHashMap(Map<? extends K,? extends V> toBeCopied)

Method Detail

clone

public Object clone()

equals

public boolean equals(Object obj)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class AbstractMap<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class AbstractMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class AbstractMap<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

Overrides:

containsValue in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

getStringValue

protected V getStringValue(String key)

Returns the value for the given key in the stringMap. Returns null if the specified key does not exist.

hasStringValue

protected boolean hasStringValue(String key)

Returns true if the given key exists in the stringMap.

putStringValue

protected V putStringValue(String key,
                           V value)

Sets the specified key to the specified value in the stringMap. Returns the value previously at that key. Returns null if the specified key did not exist.

removeStringValue

protected V removeStringValue(String key)

Removes the specified key from the stringMap and returns the value that was previously there. Returns null if the specified key does not exist.