From:    honda@luckstar.com.tw
Date:    2017-01-29
Subject: Collection-ArrayList.txt

ref:
https://msdn.microsoft.com/en-us/library/system.collections.arraylist(v=vs.110).aspx

1. 可存放(Object型態)的物件清單.
2. 可以index存取元素.
3. 可增減元素個數.
4. 可使用查詢, 排序等方法.
5. 不建議使用, 因為須執行boxing/unboxing程序, 效能較差. 替代方案為:
5.1 若需處理異質物件(heterogeneous), 則改用List<Object>.
5.2 若需處理同值物件(homogeneous, 則改用List<T>
6. 元素不維持排序. 若需維持排序, 則改用SortedSet<T>
7. 元素可為null.
8. 元素可重複.

----------

using System;
using System.Collections;
public class SamplesArrayList  {

   public static void Main()  {

      // Creates and initializes a new ArrayList.
      ArrayList myAL = new ArrayList();
      myAL.Add("Hello");
      myAL.Add("World");
      myAL.Add("!");

      // Displays the properties and values of the ArrayList.
      Console.WriteLine( "myAL" );
      Console.WriteLine( "    Count:    {0}", myAL.Count );
      Console.WriteLine( "    Capacity: {0}", myAL.Capacity );
      Console.Write( "    Values:" );
      PrintValues( myAL );
   }

   public static void PrintValues( IEnumerable myList )  {
      foreach ( Object obj in myList )
         Console.Write( "   {0}", obj );
      Console.WriteLine();
   }

}


/* 
This code produces output similar to the following:

myAL
    Count:    3
    Capacity: f
    Values:   Hello   World   !

*/