private void menu() {
		String option = "";
		while (isRunning) {
			System.out.println();
			System.out
					.println("Cac tham so khi su dung chuong trinh. Click vao man hinh chon phim can dung");
			System.out
					.println("-  Q Ket thuc chuong tring. Khong duoc tat truc tiep phai dung Q de luu du lieu.");
			System.out.println();
			try {
				option = keyboard.readLine();
			} catch (Exception e) {
			}
			if ("Q".equals(option.toUpperCase())) {
				doExit();
			} else {
				System.out.println("Invalid option. Choose between Q to exit.");
			}
		}
	}