////   This file contains the C# code from Program 6.2 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C#"//   by Bruno R. Preiss.////   Copyright (c) 2001--2002 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.brpreiss.com/books/opus6/programs/pgm06_02.txt//public class StackAsArray : AbstractContainer, Stack{    protected object[] array;    // ...}