InterfaceStudy/InterfaceStudy.Examine/ClassA.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace InterfaceStudy.Examine
{
    public class ClassA : I
    {
        public int i = 1;

        public ClassA()
        {
            ++ i;
        }

        void I.Print()
        {
            Console.WriteLine(i);
        }

        public virtual void Print()
        {
            Console.WriteLine(++i);
        }
    }
}