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SCJP/OCJP 6

 
Greenhorn
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I come to about Concurrent Collections i.e ConcurrentHashMap today but i never heard about it in any book( including Kathy sierra and Bert bates )or mock exam .

so my question:-
Is Concurrent Collections topic of Ocpjp 6 exam?
 
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I don't think it's listed in the official exam topics of the OCPJP6 certification exam.
 
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