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Once you have defined an abstract method, Java forces you to define nonabstract methods accessible to all nonabstract subclasses of the abstract class.
For example, because both the Movie class and the Symphony class
are subclasses of the Attraction class, both must
have rating methods. On the other hand, if the Movie class
were to have subclasses, no rating method would be required in those
subclasses, because they would inherit the nonabstract rating method
from the Movie class.