Updated Students Class

package com.company;

import java.util.ArrayList;

    public class Student {
        private String studentName;
        private int studentLevel;
        private int studentGrade;
        private Course course;
        static ArrayList<Student> students = new ArrayList<>();

    //Constructions
    public Student(String sn, int sl, int sg, String cn, int ch, String cg){
        setStudentName(sn);
        setStudentLevel(sl);
        setStudentGrade(sg);
        course = new Course(cn, ch, cg);
    }
    public Student(){

    }

    //Setters and Getters
    public void setStudentName(String sn){
        studentName = sn;
    }
    public void setStudentLevel(int sl){
        studentLevel = sl;
    }
    public void setStudentGrade(int sg){
        studentGrade = sg;
    }
    public String getStudentName(){
        return studentName;
    }
    public int getStudentLevel(){
        return studentLevel;
    }
    public int getStudentGrade(){
        return studentGrade;
    }

    //Used methods
    public void addStudent(Student student){ //1
        students.add(student);
    }
    public void update(int index, String name, int level, int grade, String courseName, int hours, String courseGrade){
        //3
        students.get(index).setStudentName(name);
        students.get(index).setStudentLevel(level);
        students.get(index).setStudentGrade(grade);
        students.get(index).course.setCourseName(courseName);
        students.get(index).course.setCourseHours(hours);
        students.get(index).course.setCourseGrade(courseGrade);
    }
    public void remove(int index){ //4
        students.remove(index);
    }
    public void view(String name){ //2
        for(int i=0; i < students.size(); i++){
            if(name.equals(students.get(i).getStudentName())){
                System.out.println("Name " + students.get(i).getStudentName());
                System.out.println("Level: " + students.get(i).getStudentLevel());
                System.out.println("Grade: " + students.get(i).getStudentGrade());
                System.out.println("Course Name: " + students.get(i).course.getCourseName());
                System.out.println("Course Hours: " + students.get(i).course.getCourseHours());
                System.out.println("Course Grade: " + students.get(i).course.getCourseGrade());
            }
        }
    }

    public void studentsInCourse(String courseName){
        for (int i=0; i<studentsNumber(); i++) {
            if(courseName.equals(students.get(i).course.getCourseName())){
                System.out.println(students.get(i).getStudentName() + " takes the " + courseName + " course.");
            }
        }
    }
    public int studentsNumber() {
        return students.size();
    }
}