C graphical tutorial (Fourth Edition)_ Chapter 15 interface: interfacesamplep271

using System;

namespace Chapter15InterfaceSampleP271
{
    class MyClass :IComparable// Class implementation reference 
    {
        public int TheValue;
        public int CompareTo(object obj)// Implementation method 
        {
            MyClass mc=(MyClass)obj;
            if (this.TheValue<mc.TheValue) return -1;
            if (this.TheValue > mc.TheValue) return 1;
            return 0;

        }
    }

    class Program
    {
        static void PrintOut(string s, MyClass[] mc)
        {
            Console.Write(s);
            foreach (var m in mc)
            {
                Console.Write("{0}、", m.TheValue);
               
            }
            Console.WriteLine("");
        }
        static void Main(string[] args)
        {
            var myInt = new[] { 20,4,16,9,2};
            MyClass[] mcArr = new MyClass[5];
            for (int i = 0; i < 5; i++)
            {
                mcArr[i] = new MyClass();
                mcArr[i].TheValue = myInt[i];
            }
            PrintOut("Initial Order:",mcArr);
            Array.Sort(mcArr);
            PrintOut("Sorted Order:", mcArr);
            Console.WriteLine("Hello World!");
        }
    }
}