I need help for a CS Project. Here are the Requirments

================================================================================================================

• • Use the Students.java, Excellent.java, and Ok.java classes from the course website and make the following modifications/additions:
  • • Create an interface Student and implement it with classes Excellent and Ok to represent the excellent and ok students correspondingly.
    • Create an ArrayList and fill it with objects of classes Excellent and Ok to store all students from the file.
    • Use the ArrayList to print all, excellent and ok students. Use the instanceof operator to distinguish between excellent and ok objects
    • ================================================================================================================
• Here is the Student.java
• import java.util.Scanner;

• import java.io.*;

  public class Students {

  public static void main (String[] args) throws IOException { String first_name, last_name; int grade, count=0; Scanner fileInput = new Scanner(new File("students.txt")); Object st; while (fileInput.hasNext()) { first_name = fileInput.next(); last_name = fileInput.next(); grade = fileInput.nextInt();

  if (grade>89) st = new Excellent(first_name, last_name, grade); else st = new Ok(first_name, last_name, grade);

  if (st instanceof Excellent) ((Excellent)st).info(); else ((Ok)st).info();

  count++; } System.out.println("There are " + count + " students"); } } Here is the Ok,java

• public class Ok { private String fname, lname; private int grade;

  public Excellent(String fname, String lname, int grade) { this.fname = fname; this.lname = lname; this.grade = grade; }

  public void info() { System.out.println(fname + " " + lname + "\t" + "Ok"); } }

• Here is the Excelent.java

• public class Excellent { private String fname, lname; private int grade;

  public Excellent(String fname, String lname, int grade) { this.fname = fname; this.lname = lname; this.grade = grade; }

  public void info() { System.out.println(fname + " " + lname + "\t" + "excellent"); } }