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Suppose that you have begun to think about a movie application, but you have not yet written any portion of that movie application. Following the principle that you should think first and hack later, you start off with a design phase, during which you think about what classes and methods you will need in your movie application.
In particular, suppose that you decide that there shall be a Movie
class, that class shall have a rating method, and that rating method
shall have no ordinary arguments and shall return an integer.