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Usually, it is a good idea to draw a class-hierarchy diagram, such as the following, to see how your classes fit together:
*-----------------------------------------* | Attraction: | | minutes | *-----------------------------------------* ^ ^ | | | Superclass | Superclass | | | | *-------------------* *-------------------* | Movie: | | Symphony: | | script | | music | | acting | | playing | | direction | | conducting | | rating method | | rating method | *-------------------* *-------------------*
Such a class-hierarchy diagram helps you to see how to distribute instance variables and instance methods among the classes in the hierarchy.