using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {

            IRequestCallBack callback = new RequestCallBack();
            callback.onSuccess("123123");


        }
    }

    interface IRequestCallBack{

        public void onSuccess(String result);

    }

    class RequestCallBack : IRequestCallBack {
        public void onSuccess(String result) {
            Console.WriteLine(result);
        }
    }

}