public class BookRentals {
	private Vector rentals;
	public String getCustomerName(String rentalId) {
		for (int i = 0; i < rentals.size(); i++) {
			BookRental rental = (BookRental) rentals.elementAt(i);

			if (rental.getId().equals(rentalId)) {
				return rental.getCustomerName();
			}
		}

		throw new RentalNotFoundException();
	}

	public void deleteRental(String rentalId) {
		for (int i = 0; i < rentals.size(); i++) {
			BookRental rental = (BookRental) rentals.elementAt(i);

			if (rental.getId().equals(rentalId)) {
				rentals.remove(i);
				return;
			}
		}

		throw new RentalNotFoundException();
	}
}