Ex-Student

package Student;

public class Student {

    private static int STUDENT_COUNT;
    private String name;
    private String course;
    private String speciality;
    private String university;
    private String email;
    private String phoneNumber;


    public Student(String name, String course, String speciality, String university,String phoneNumber) {
        this.name = name;
        this.course = course;
        this.speciality = speciality;
        this.university = university;
        this.email = null;
        this.phoneNumber = phoneNumber;
        STUDENT_COUNT++;
    }

    public Student(String name, String course, String speciality, String university) {
        this.name = name;
        this.course = course;
        this.speciality = speciality;
        this.university = university;
        this.email = null;
        this.phoneNumber = null;
        STUDENT_COUNT++;
    }

    public Student(String name, String course, String speciality,
                   String university, String email, String phoneNumber) {
        this.name = name;
        this.course = course;
        this.speciality = speciality;
        this.university = university;
        this.email = email;
        this.phoneNumber = phoneNumber;
        STUDENT_COUNT++;
    }


    @Override
    public String toString() {

        String result = String.format("Student: %s from %s with %s (%s)\n",
                this.name,this.course,this.speciality,this.university);

        if (this.email != null){
            result += String.format("Email: %s",this.email);
        }

        if (this.phoneNumber != null){
            result+= String.format("PhoneImpl number: %s",this.phoneNumber);
        }

        return result;
    }