Generic ArrayList

import java.util.*;
class GenericArrayList
{ public static void main(String[] args)
 { ArrayList<Integer> al=new ArrayList<Integer>();
  al.add(1); //Auto Boxing
  al.add(2); //Auto Boxing
  al.add(3); //Auto Boxing
  al.add(4); //Auto Boxing
  System.out.println("Contents of al : "+al) ;
  System.out.println("Iterating using for-each loop");
  for(int i : al) //Auto Unboxing
  {
   System.out.print(i + " ");
  }
 }
}