Varsha Sharma

• Jun 14th, 2005

 

Hashtable is synchronized means it's therad safe ,where as hashmap is not . 
and hash table can't store null value hashmap can store null values.

kumpsath

 Profile Answers by kumpsath 

• Sep 19th, 2009

 

Hashtable is synchronized means it's therad safe where as hashmap is not and hash table can't store null value hashmap can store null values. HashTable is thread safe is because, it makes lock in it when it executes get() or put() methods. It is good one when you use the data in an multi-threading application. You may try use hashmap inside synchronized block.

bhushanamca

 Profile Answers by bhushanamca 

• Oct 3rd, 2009

 

Hashtable does not allow null values or null keys, whereas hash map allows null keys and null values. Hashtable is synchronzied whareas hashmap is not synchronized. In case of single thread using hashmap is faster than the hashtable. In case of multiple thereads, using hashtable is advisable.

cristi.bcnr

 Profile Answers by cristi.bcnr 

• Feb 9th, 2011

 

Yes, but hashtable is obsolete, so be carefull.