public static void B_EncapsulationAsHidingOfRealization()
{
var deliveryService = new DeliveryService();
// We do not know, how delivery service works,
// we give them our package and they must to deliver it.
var smallSpecialGift = new SpecialFilledAndDecoratedGiftBox(2, "Yellow");
deliveryService.DeliverGift(smallSpecialGift);
var bigSpecialGift = new SpecialFilledAndDecoratedGiftBox(17, "Red");
deliveryService.DeliverGift(bigSpecialGift);
}