import java.util.*;

class Test {
    public static void main(String[] args) {
        Collection<Beverage> bevs = new HashSet<Beverage>();
        bevs.add(
            new EspressoBeverage("americano", 3.00, Size.small, 2, Cup.toGo)
            );
        bevs.add(
            new MilkEspressoBeverage("latte", 3.50, Size.medium, Cup.toStay, Milk.whole)
            );
        System.out.println(bevs);
    }
}