Вижу ошибку, не понимаю почему. 
package com.javarush.task.task14.task1408;

/*
Куриная фабрика
*/

public class Solution {
    public static void main(String[] args) {
        Hen hen = HenFactory.getHen(Country.BELARUS);
        hen.getCountOfEggsPerMonth();
    }

    static class HenFactory {

        public  Hen getHen(String country) {
            Hen hen = new BelarussianHen();

            if (country.equals("BELARUS")) {
                hen = new BelarussianHen();
            } else if (country.equals("RUSSIA")) {
                hen = new RussianHen();
            } else if (country.equals("UKRAINE")) {
                hen = new UkrainianHen();
            } else if (country.equals("MOLDOVA")) {
                hen = new MoldovanHen();
            }

            return hen;
        }
    }


}