Java Hashmap And Hashtable
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Java Hashmap And Hashtable
It is kind of like hashmap but is synchronized. Hashtable doesn't allow any null key or value. Both the classes use hash table internally to store the elements.
Hashtable doesn't allow any null key or value. Util and is a concrete implementation of a dictionary. 1) hashmap is non synchronized.
If we need to perform operations faster in set, we need to use hashset.
Hashmap is comparatively faster and uses less memory as it is not synchronized and so it is preferred over hashtable if thread safety is not a concern. It inherits abstractmap class and implements the map interface. The hashtable class implements a hash table, which maps keys to values. 1.hashmap is only one of the fastest data structures implemented in java to insert/delete/search，hashset is as fast as hashmap to insert/delete/search,and arraylist is as fast as hashmap when insert a element to the end.
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