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Write a program called CollegeCourse that computes the cost of taking a college course. Include a constructor that requires a course ID number. Add a subclass Lab to compute a lab fee for a course that uses a lab. Write a program UseCourse to use the classes. Save the progras as CollegeCourse, Lab, and UseCourse. Put them all in a package called edu.ynu.lab7. Hints: how to compile and run your programs in the DOS environment, if using Jcreator you don't have to worry about this (suppose you
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