public class Student implements Comparable<Student> {

//	student id, 1-1000
	int sid;
	Birthday sbirthday;


//	constructor 
	public Student(int id, Birthday.Month month, int date){ 
		this.sid = id;
		this.sbirthday = new Birthday();
		this.sbirthday.month = month ;
		this.sbirthday.date = date;
	} 

//	compare the student according to their birthday. 
	public int compareTo(Student s) {
		if (this.sbirthday.month.compareTo(s.sbirthday.month) == -1){
			return -1;
		}
		else if (this.sbirthday.month.compareTo(s.sbirthday.month) == 1){
			return 1;
		}
		else {
			if (this.sbirthday.date > s.sbirthday.date){
				return 1;
			}
			if (this.sbirthday.date < s.sbirthday.date) {
				return -1;
			}
			else {
				return 0;
			}
		}
		
	}
//	display the personal information of a student in such form:
//	id, month of birthday, date of birthday
//	e.g. ID: 10, Month: MAY, Date: 11
	public void display(){
		System.out.println("ID: " + sid + ", Month: " + sbirthday.month + ", Date: " + sbirthday.date);
	} 
	public static void main(String[] args) {
		 Student a = new Student(1, Birthday.Month.JAN, 7);
		 Student b = new Student(2, Birthday.Month.APR, 5);
		 Student c = new Student(3, Birthday.Month.MAY, 5);
		 a.display();
		 b.display();
		 c.display();
		 System.out.println(a.compareTo(b));
		 System.out.println(b.compareTo(c));
		 System.out.println(a.compareTo(c));
		 }
	
}