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Collections: IdentityHashMap Class

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This constructor constructs a new, empty identity hash map with a default expected maximum size (21).
IdentityHashMap(int expectedMaxSize)
This constructor constructs a new, empty IdentityHashMap with the specified expected maximum size
IdentityHashMap(Map m)
This constructor constructs a new identity hash map containing the keys-value mappings in the specified map
void clear()
Removes all mappings from this map.
Object clone()
Returns a shallow copy of this identity hash map: the keys and values themselves are not cloned.
boolean containsKey(Object key)
Tests whether the specified object reference is a key in this identity hash map.
boolean containsValue(Object value)
Tests whether the specified object reference is a value in this identity hash map.
Set entrySet()
Returns a set view of the mappings contained in this map.
boolean equals(Object o)
Compares the specified object with this map for equality.
Object get(Object key)
Returns the value to which the specified key is mapped in this identity hash map, or null if the map contains no mapping for this key.
int hashCode()
Returns the hash code value for this map.
boolean isEmpty()
Returns true if this identity hash map contains no key-value mappings.
Set keySet()
Returns an identity-based set view of the keys contained in this map.
Object put(Object key, Object value)
Associates the specified value with the specified key in this identity hash map.
void putAll(Map t)
Copies all of the mappings from the specified map to this map These mappings will replace any mappings that this map had for any of the keys currently in the specified map.
Object remove(Object key)
Removes the mapping for this key from this map if present.
int size()
Returns the number of key-value mappings in this identity hash map.
Collection values()
Returns a collection view of the values contained in this map.