Click here to hide categories Click here to show left categories

User: Home          welcome : Guest          Log In / Register here     




C#/.NET interview Question - Who perform faster?Array or Arraylist


Answer:
Let’s demonstrate an example to prove that how arrays are faster than arraylist for that go to visual studio and create a simple window application with a button and two labels like below diagram.
 

Below is the code snippet.

 

using System.Collections;// import this namespace to access arraylist.
using System.Diagnostics;// import this namespace to access Stopwatch.
namespace ArrayandArrayList
{
public partial class Form1 : Form
{
int[] Array = new int[1000]; // here array is declared.
ArrayList objArraylist = new ArrayList();// here array list is declared.
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Stopwatch objWatch = new Stopwatch();
Stopwatch objWatch1 = new Stopwatch();
objWatch.Start();
for(int i=0;i<1000;i++)
{
Array[i] = DateTime.Now.Second;
}
foreach (int i in Array)
{

}
objWatch.Stop();
label1.Text = objWatch.ElapsedTicks.ToString();
objWatch1.Start();
for (int i = 0; i < 1000; i++)
{
objArraylist.Add(DateTime.Now.Second.ToString());
}
foreach (object i in objArraylist)
{
}
objWatch1.Stop();
label2.Text = objWatch1.ElapsedTicks.ToString();
}
}
}
In the above code, I have used Stopwatch to record the time taken by the array and  arraylist to performance actions.

 

The Output look like below diagram.

Conclusion: -As in ArrayList lots of Boxing and UnBoxing are done therefore its performance is slower than Array because in Array there is no type casting.

 

Please click here to see more C#/.NET interview questions

Regards,

Visit Authors blog for more C#/.NET interview questions

Share this article   |    Print    |    Article read by 7554 times
Author:
Shivprasad koirala Koirala
I am a Microsoft MVP for ASP/ASP.NET and currently a CEO of a small E-learning company in India. We are very much active in making training videos , writing books and corporate trainings. Do visit my site http://www.questpond.com for .NET, C# , design pattern , WCF , Silverlight , LINQ , ASP.NET , ADO.NET , Sharepoint , UML , SQL Server training and Interview questions and answers
Related Articles: No related article
Related Interview Questions: