java - do not understand Class<? extends VersionedProtocol> protocol; -


when reading java program, meet following piece line of code

class<? extends versionedprotocol> protocol;

what <? extends versionedprotocol> stand for? mechanism define class?

the class class has generic type parameter represents itself. here class<? extends versionedprotocol> means class object representing versionedprotocol class or subclass of versionedprotocol.

this known upper-bounded wildcard in java generics.


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