factory-pattern.cs

public interface Girl
    {
        void check();
    }
    class Vietnamese : Girl
    {
        public void check()
        {
            Console.WriteLine("Girl from Vietnam");
        }
    }
    class Chinese : Girl
    {
        public void check()
        {
            Console.WriteLine("Girl from China");
        }
    }

    class Japanese : Girl
    {
        public void check()
        {
            Console.WriteLine("Girl from Japan");
        }
    }