The IdentityHashMap is also like the HashMap with the exception that a key is considered equal to another key only if they are pointing to the exact same object. Other implementations of Map use the equals( ) method to determine if two keys are equal. The IdentityHashMap uses the == comparator. Two keys (a and b) are considered equal if a == b. The IdentityhashMap should only be used in the cases where this functionality is required. It should not be used otherwise.
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