About Question enthuware.ocpjp.v8.2.1512 :
Posted: Wed Mar 09, 2016 7:18 am
ConcurrentMap is an interface not a class.
Yes, ConcurrentMap is an interface. The word classes in the explanation is used in a general sense, which includes classes, interfaces, and also enums. It has been updated to avoid the confusion.
thank you for your feedback!
Paul.