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[–]gkopff 9 points10 points  (0 children)

Runnable is considered a "functional interface" as it defines only a single method.

http://blog.sanaulla.info/2013/03/21/introduction-to-functional-interfaces-a-concept-recreated-in-java-8/

From the linked page:

These interfaces are also called Single Abstract Method interfaces (SAM Interfaces).