public class Student
{
    // instance variables - replace the example below with your own
    private String forename;
    private String surname;
    private int id;
    private String address;

    //create numberOfCredits as an integer as of now
    private int studentCredits;

    //Create list of module student is enrolled on
    ObjectArrayList studentModules = new ObjectArrayList();

    public Student(String forename, String surname, int id, String address)
    {
        this.forename = forename;
        this.surename = surname;
        this.id = id;
        this.address = address;

    }

    //Taking mod as module name
    public boolean addEnrolledOn(Module mod)
    {
        //check if the module already exist in studentModules
        if (this.studentModules.contains(mod))  {
            return false;
        }
        else if (this.studentCredits + Module.numberOfCredits() <= 120) {
            //Add mod to studentModules
            //add the module's number of credits to studentCredits
            this.studentModules.add(mod);
            this.studentCredits += mod.numberOfCredits();
            return true;
        }
        else    {
            return false;
        }

    }

    public boolean removeEnrolledOn(Module mod)
    {
        //If student has not recorded it is enrolled on module, return false
        // otherwise if successfully remove module, return true
        if (!Module.students.contains(student)) {
            return false;
        }
        else if (this.studentModules.remove(mod))    {
            this.studentCredits -= mod.numberOfCredits();
            return true;
        }
    }

    //Return amount of credits currently enrolled as in Integer
    public int creditsEnrolledOn()
    {
        return this.studentCredits;
    }

    //Check if object comparing is the same object, else return false
    public boolean equals(Object obj)
    {
        if (obj instanceof Student)  {
            Student other = (Student) obj;
            if (other.forename.equals(this.forename) &&
            other.surname.equals(this.surname) &&
            other.id.equals(this.id) &&
            other.address.equals(this.address))    {
                return true;
            }

        }
    }
}