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What is difference between HashMap and HashTable?

Following are some difference as :

                                   HashMap                         HashTable
1 Hashmap is not synchronized in nature .
 		 1 Hashtable is synchronised.
 
2 iterator in the HashMap is fail-safe .
Fail-safe - “if the Hashtable is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove method, the iterator will throw a ConcurrentModificationException”
 		 2 while for the Hashtable is not.
 
3 HashMap permits null values and only one null key.
 		 3 while Hashtable doesn't allow key or value as null.
 
4 HashMap use iterator.
 		 4 Hashtable use enumeration.
 
5 HashMap is faster. 5 Hashtable is slower.

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Posted on Feb 2, 2019 by Rajesh Kumar

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