public boolean validate() {
		
		if (!HAS_DAY || !HAS_TIME || !HAS_NAME) {
			VALIDATED = false;
			return VALIDATED;
		}
		
		if (HAS_TEACHER == false) setTeacher("Unknown");
		if (HAS_ROOM == false) setRoom("Unknown");
		
		generatePID();
		VALIDATED = true;
		return VALIDATED;
	}