Java HashMap class implements the map interface by using a hashtable. It inherits AbstractMap class and implements Map interface.

The important points about Java HashMap class are:

A HashMap contains values based on the key.
It contains only unique elements.
It may have one null key and multiple null values.
It maintains no order.
hashmap is non-synchronised -- not thread safe
It gives Concurrent modification exception -- in case of Fail - Fast condition

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