public class Student  extends Person{

	private String studentId;

	public Student() {
		//this("", "", "");
	}
	// constructor
	public Student(String name, String phoneNumber, String studentId){
		super(name,phoneNumber); // call parent's cons
		this.studentId = studentId;
	}


	public String toString() {
		return super.toString() + " has student ID" + studentId;
	}

}