// ArrayListTest.cs: Using class ArrayList.
using System;
using System.Collections;

public class ArrayListTest
{
   private static readonly string[] colors = 
      { "MAGENTA", "RED", "WHITE", "BLUE", "CYAN" };
   private static readonly string[] removeColors = 
      { "RED", "WHITE", "BLUE" };

   // create ArrayList, add colors to it and manipulate it
   public static void Main( string[] args )
   {
      ArrayList list = new ArrayList( 1 ); // initial capacity of 1  

      // add the elements of the colors array to the ArrayList list
      foreach (var color in colors)
      {
          list.Add(color); // add color to the ArrayList list       
      }

      // add elements in the removeColors array to 
      // the ArrayList removeList with the ArrayList constructor
      ArrayList removeList = new ArrayList( removeColors );

      Console.WriteLine( "ArrayList: " );
      DisplayInformation( list ); // output the list

      // remove from ArrayList list the colors in removeList
      RemoveColors( list, removeList );

      Console.WriteLine( "\nArrayList after calling RemoveColors: " );
      DisplayInformation( list ); // output list contents
   } // end Main

   // displays information on the contents of an array list
   private static void DisplayInformation( ArrayList arrayList )
   {
      // iterate through array list with a foreach statement
       foreach (var element in arrayList)
       {
           Console.Write("{0} ", element); // invokes ToString
       }

      // display the size and capacity
      Console.WriteLine( "\nSize = {0}; Capacity = {1}",
                         arrayList.Count, arrayList.Capacity );

      int index = arrayList.IndexOf( "BLUE" );

      if (index != -1)
      {
          Console.WriteLine("The array list contains BLUE at index {0}.",
                             index);
      }
      else
      {
          Console.WriteLine("The array list does not contain BLUE.");
      }
   } // end method DisplayInformation

   // remove colors specified in secondList from firstList
   private static void RemoveColors( ArrayList firstList,
      ArrayList secondList )
   {
      // iterate through second ArrayList like an array
      for ( int count = 0; count < secondList.Count; count++ )
         firstList.Remove( secondList[ count ] );
   } // end method RemoveColors
} // end class ArrayListTest