Course Grades In a course, a teacher gives the following tests and assignments:...

Course Grades

In a course, a teacher gives the following tests and assignments:

• A lab activity that is observed by the teacher and assigned a numeric score.

• A pass/fail exam that has 10 questions. The minimum passing score is 70.

• An essay that is assigned a numeric score.

• A final exam that has 50 questions.

Write a class named CourseGrades . The class should have a GradedActivity array named grades as a field. The array should have four elements, one for each of the assignments previously described. The class should have the following methods:

setLab : This method should accept a GradedActivity object as its argument. This object should already hold the student’s score for the lab activity. Element 0 of the grades field should reference this object.

setPassFailExam : This method should accept a PassFailExam object as its argument. This object should already hold the student’s score for the pass/fail exam. Element 1 of the grades field should reference this object.

setEssay : This method should accept an Essay object as its argument. (See Programming Challenge 4 for the Essay class. If you have not completed Programming Challenge 4, use a GradedActivity object instead.) This object should already hold the student’s score for the essay. Element 2 of the grades field should reference this object.

setFinalExam : This method should accept a FinalExam object as its argument. This object should already hold the student’s score for the final exam. Element 3 of the grades field should reference this object. toString : This method should return a string that contains the numeric scores and grades for each element in the grades array.

Demonstrate the class in a program.