Chapter 9, Problem 6PC

Analyzable Interface

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

  public interface Analyzable

  {

  double getAverage();

GradedActivity getHighest();

GradedActivity getLowestf();

  }

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.