JAVA ДЛЯ ПОТОКОВ ИВБО / ПР-14 / DeliveryCostCalculator

public class DeliveryCostCalculator {
    public static void main(String[] args) {
        double weight = 2.5;
        double distance = 100.0;

        DeliveryStrategy strategy;

        strategy = new StandardDelivery();
        System.out.println("Стоимость стандартной доставки: " + calculateDeliveryCost(strategy, weight, distance));

        strategy = new ExpressDelivery();
        System.out.println("Стоимость экспресс-доставки: " + calculateDeliveryCost(strategy, weight, distance));

        strategy = new CourierDelivery();
        System.out.println("Стоимость курьерской доставки: " + calculateDeliveryCost(strategy, weight, distance));
    }

    public static double calculateDeliveryCost(DeliveryStrategy strategy, double weight, double distance){
        return strategy.calculateCost(weight, distance);
    }
}