using System;

namespace ConsoleApplication1
{
 /// <summary>
 /// Class1 的摘要說明。
 /// </summary>
 class Class1
 {
  /// <summary>
  /// 應用程式的主入口點。
  /// </summary>
  [STAThread]
  static void Main(string[] args)
  {   
   Gen[] objGen=new Gen[2];
   objGen[0]=new Zhi();
   objGen[1]=new NewZhi();
   foreach (Gen g in objGen)
   {
    System.Console.WriteLine(g.printHello());
   }
  }
 }
 abstract class Gen
 {
  public virtual string printHello()
  {
   return "it's an abstract method";
  }
 }
 class Zhi:Gen
 {
  public override string printHello()
  {
   return "it's an override method";
  }
 }
 class NewZhi:Gen
 {
  public new string printHello()
  {
   return "it's a new method";
  }
 } 
}