Java Program of swap two elements in an array list

import java.util.*;
public class demo1
{
 public static void main(String[] args)   
 {
  List<String> list = new ArrayList<String>();
  list.add("C#");
  list.add("C++");
  list.add("Python");
  list.add("Perl");
  list.add("Ruby");
  list.add("Java");
  System.out.println("Array list before Swap:");         
  System.out.println(list);
        
  Collections.swap(list, 2, 5);
  System.out.println("Array list after swap:");          
  System.out.println(list);
 }    
}