Class 6 Prep Exercises

1. In your Student class, update the code with implementations for addGrade and getGradeLevel which were sketched out in Classes and Objects: Encapsulating Behavior. For the method addGrade, you'll need to update the student's GPA. To do this, note that GPA is computed via the formula:

   gpa = (total quality score) / (total number of credits)

   The total quality score is the sum of the quality scores of all classes, and the quality score for a class is found by multiplying the point score (0.0-4.0) by the number of credits. For example, if a student received an A (worth 4 points) in a 3-credit course and a B (worth 3 points) in a 4-credit course, their quality score would be: 4.0 * 3 + 3.0 * 4 = 24. And their GPA would then be 24 / 7 = 3.43.

   To update the GPA, you'll need to update the quality score. You can compute the existing quality score by calculating gpa * numberOfCredits. Then update the quality score and numberOfCredits, and compute the new GPA with the new numbers.

   In getGradeLevel you will need to determine the level of the student based on the number of credits: freshman (0-29 credits), sophomore (30-59 credits), junior (60-89 credits), or senior (90+ credits).

2. Add custom equals() and toString() methods to the Student class.
3. Add custom equals() and toString() methods to the Course class which you started in the exercises for class 5.