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There are following problems:
- mani.agnihotri August 25, 2015* public constructor
* Not Thread safe
* If you synchronise the method the second question would come about whether synchronisation is needed at all, since once the instance is created there is no use of the method access to be synchronised. So you should be aware of double check locking implementation.
Having volatile makes sure non of the threads have a local dirty copy of the instance.