Generics - ArrayList
Introduction
An ArrayList works like an Array and is similar, but not as powerful as a List<T> ; it is an improvment on an array.
The code below demonstrates an ArrayList:
You will need to add using Systems.Collections before the namespace.
namespace ArrayListDemo
{
internal class Program
{
static void Main(string[] args)
{
ArrayList names = new ArrayList();
int element;
LoadArrayList(names);
Console.WriteLine("Original ArrayList");
DisplayNames(names);
Console.Write($"\nEnter element to inspect (0 to {names.Count - 1}): ");
element = int.Parse(Console.ReadLine());
DisplayElement(names, element);
SortArrayList(names);
Console.WriteLine("\nSorted ArrayList");
DisplayNames(names);
Console.Write($"\nEnter element to inspect (0 to {names.Count - 1}): ");
element = int.Parse(Console.ReadLine());
DisplayElement(names, element);
Console.ReadLine();
}//eom
static void LoadArrayList(ArrayList names)
{
string name;
Console.Write("Enter name to add to the ArrayList, or zzz to quit: ");
name = Console.ReadLine();
while (!name.Equals("zzz"))
{
names.Add(name);
Console.Write("Enter name to add to the ArrayList, or zzz to quit: ");
name = Console.ReadLine();
}
}//eom
static void DisplayNames(ArrayList names)
{
Console.WriteLine("List of Names:");
foreach (string name in names)
{
Console.WriteLine(name);
}
}//eom
static void DisplayElement(ArrayList names, int element)
{
Console.WriteLine($"\nName at {element} is {names[element]}");
}//eom
static void SortArrayList(ArrayList names)
{
names.Sort();
}//eom
}//eoc
}//eon
