I need help completing this Java Assignment.

Create a class Student with following attributes in private scope; long rollNo; String name; int mark1;//English int mark2;//Science int mark3; //Mathematics int mark4;//General Knowledge Create the default as well as parameterized constructor for the Student class. Also create getter and setter for the above attributes. Create another class StudentRatingSystem. In the main method, create a student object and set the value for above student attributes Create a method generateRating (Student s) to generate the rating of the student in the following format; Roll No : 10001 Mark1 : 78 Mark3 : 81 Grade : A Name : Anoop Mark2 : 82 Mark4 : 85 the rating is calculated using the below rule; If the Average Mark (average of Mark, Mark2, Mark3, Mark4) is between; 90 80 70 60 0 100 89 79 69 59 Grade ="A+" Grade ="A" Grade "B". Grade = "C" Grade = "D" NB: If the Average Mark is less than 0, then put the grade as "NA