Your supervisor has the right information about who does what in the classroom. This is the only reliable source of information (except when several users use the same user / password).
I usually don't need the @author tag, which most of the time automatically inserts the IDE when creating the class. Use it the way you want and select the format you want.
By the way, who works more? The one who writes all the code in the class, or the one who changes one line of code to fix a production error after two weeks of investigation?
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