Please Explain Why Output is so?

[vishal mishra]

Namaste !! to all Friends

I have found a question in a document which i have downloaded from the site www.examcertify.com

Question is-:

import jav a.util.*;
 public class SortOf 
{ 
  public static void main(String[] args)
 {
     ArrayList<Integer> a = new ArrayList<Integer>();
     a.add(1);
     a.add(5);
     a.add(3);
     Collections.sort(a);
     a.add(2);
     Collections.reverse(a);
     System.out.println(a);

  } 
}

Output given-:[2, 5, 3, 1]

I have compiled the program and executed it.It is giving the same output.
According to me output should be [5,3,2,1].
Please Explain me Why output is not what i thought...

[Ulf Dittmer]

Let's turn around and ask you: why do you think the output should be [5,3,2,1]?

[vishal mishra]

Thanks !! I got it !!