Java netbeans, points out of 10

Exercise#3 Create a class CourseGrades that consists of two data fields, student_id and grade. The class has set and get methods for each data variable. Then, write a Java program that reads students ids and corresponding grades into an array of type CourseGrades and print the average grade for the class. Your program should have two methods in addition to main(), one method for reading the students ids and grades and another method for computing the average grade