using System;
using System.Collections;
public class ArrayListDemo {
public static void Main() {
ArrayList al = new ArrayList();
Console.WriteLine("Initial capacity: " + al.Capacity);
Console.WriteLine("Initial number of elements: " + al.Count);
Console.WriteLine();
Console.WriteLine("Adding 6 elements");
// Add elements to the array list
al.Add('C');
al.Add('A');
al.Add('E');
al.Add('B');
al.Add('D');
al.Add('F');
Console.WriteLine("Current capacity: " +
al.Capacity);
Console.WriteLine("Number of elements: " +
al.Count);
// Display the array list using array indexing.
Console.Write("Current contents: ");
for(int i=0; i < al.Count; i++)
Console.Write(al[i] + " ");
Console.WriteLine("\n");
Console.WriteLine("Removing 2 elements");
// Remove elements from the array list.
al.Remove('F');
al.Remove('A');
Console.WriteLine("Current capacity: " +
al.Capacity);
Console.WriteLine("Number of elements: " +
al.Count);
// Use foreach loop to display the list.
Console.Write("Contents: ");
foreach(char c in al)
Console.Write(c + " ");
Console.WriteLine("\n");
Console.WriteLine("Adding 20 more elements");
// Add enough elements to force al to grow.
for(int i=0; i < 20; i++)
al.Add((char)('a' + i));
Console.WriteLine("Current capacity: " +
al.Capacity);
Console.WriteLine("Number of elements after adding 20: " +
al.Count);
Console.Write("Contents: ");
foreach(char c in al)
Console.Write(c + " ");
Console.WriteLine("\n");
// Change contents using array indexing.
Console.WriteLine("Change first three elements");
al[0] = 'X';
al[1] = 'Y';
al[2] = 'Z';
Console.Write("Contents: ");
foreach(char c in al)
Console.Write(c + " ");
Console.WriteLine();
}
}