It is obvious that this is a method header. Perhaps this determination is the purpose of the question.
It would seem to me, though, that this is also the header for the main method in a
Java application that could serve as the main entry point for the JVM to that application.
So, does "Is this legal?" mean:
"Is this legal as a method header?"
or
"Is this legal as the main entry point to an application?" (or similar wording)
Sure, in both cases the answer is the same. That's why I'm just calling it nitpicking.