public static void displayStudent(int mode) {
		if (FileReadService.sList.isEmpty()) {
			System.out.println("There is no Students !");
		} else {
			System.out.println("Which student do you want to choose ?");
			int i;
			for (i = 0; i < FileReadService.sList.size(); i++) {
				System.out.print(i + ":("
						+ FileReadService.sList.get(i).displayNames() + ") ");
			}
			System.out.println();
			Scanner scIndexS = new Scanner(System.in);

			Student s = null;
			while (s == null) {
				int iS = scIndexS.nextInt();
				s = chooseStudentList(iS);
			}
			if (mode == 0) {
				System.out.println(s);
			} else {
				System.out.println(s.displayAverage());
			}
		}
	}