Analyzable InterfaceModify the CourseGrades class you created in Programming Challenge 5 s...

Analyzable Interface

Modify the CourseGrades class you created in Programming Challenge 5 so it implements the following interface:

The getAverage method should return the average of the numeric scores stored in the grades array. The getHighest method should return a reference to the element of the grades array that has the highest numeric score. The getLowest method should return a reference to the element of the grades array that has the lowest numeric score. Demonstrate the new methods in a complete program.

Programming Challenge 5

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:

Demonstrate the class in a program.

Programming Challenge 4

Essay Class

Design an Essay class that extends the GradedActivity class presented in this chapter. The Essay class should determine the grade a student receives for an essay. The student’s essay score can be up to 100 and is determined in the following manner:

Grammar: 30 points

Spelling: 20 points

Correct length: 20 points

Content: 30 points

Demonstrate the class in a simple program.