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Exercise 12.2
Course and Project classes

In the earlier exercise about courses and projects (found in the lecture about abstract classes and interfaces) we refined the program about BooleanCourse, GradedCourse, and Project to use a common superclass called Course. Revise your solution (or the model solution) such that the courses in the class Project are represented as a variable of type List<Course> instead of by use of four variables of type Course.

Reimplement and simplify the method Passed in class Project. Take advantage of the new representation of the courses in a project, such that the "3 out of 4 rule" (see the original exercise) is implemented in a more natural way.