What is the differnece between ArrayList and List?

ArrayList is non-generic collection and List is a specific type collection type. List Collection accepts only a specific type of data only.

ArrayList arrlist=new ArrList();

ArrayList arrlist = new ArrayList();

arrlist.Add(10);

arrlist.Add("dfasdfa")

           

arrlist ---acceptsà any type of data like int ,string,double….and

arrlist(new string[] {“adfasd”,”dfasdf”,”dfasd”});--any type. But in comes to

List<string> strlist = new List<string>();

strlist.Add("anand");

strlist.Add("balu");

strlist.Add("charan");

strlist.Add("rohit");

List<T> type it will only accepts a specific data,That is T[int,doubl,foloat,…employee] type.

ArrayList accepts any type which implements ICollection. As obsely which accepts array also it can be int array,string array,float arry.

Ok as well ArrayList implements IList so which accepts List Collection

Also as argument and prepares ArrayList type of collection.

ListCollection is strong Collection

ArrayList is Weak Collection Accorinding to performance. But is any where required to convert List Collection type to ArrayList Collection.

We have to Choose Adapter(IList item) method.

Ex:

List<string> strlist = new List<string>();

strlist.Add("anand");

strlist.Add("balu");

strlist.Add("charan");

strlist.Add("rohit"); 

ArrayList listtoarray = new ArrayList();

listtoarray = ArrayList.Adapter(strlist);

Console.WriteLine(listtoarray.Count);

Adapter is a static method which accepts a collection which implements IList Interface.

Adapter method takes any List like List<int>,List<string>,List<Employee>…ect

As well as

IList interface defines an indexer

object this[int index] { get; set; };

then ArrayList as well as any List<T> types also can we can easily indexing them any element.

Ex:

ArrayList arrlist = new ArrayList();

arrlist.Add("kasi");

arrlist.Add(10);

arrlist.Add(10.52);

arrlist.Add(DateTime.Now);

Console.WriteLine(arrlist[0]);

Console.WriteLine(arrlist[1]);

Console.WriteLine(arrlist[2]);

Console.WriteLine(arrlist[3]);     

ArrayList Elements are indexed and

List<string> strlist = new List<string>();

strlist.Add("anand");

strlist.Add("balu");

strlist.Add("charan");

strlist.Add("rohit");

           

Console.WriteLine(strlist[0]);

Console.WriteLine(strlist[1]);

Console.WriteLine(strlist[2]);

Console.WriteLine(strlist[3]);