public class IntList { 
  int item;
  IntList next;

 IntList(int item, IntList next) { 
   this.item = item;
   this.next = next;
 }
  
 static IntList empty = null;
 static boolean isEmpty(IntList l) {
  return l == empty;
 }

 ========== creating lists of elements ========
  IntList l1 = new IntList(1,empty);
  IntList l2 = new IntList(2,l1);
    .
    .
    .
 =============================================

static int getElement(int n, IntList l) P
  if (n==0)
   return l.item;
  else
   return getElement(n-1, l.nextl
}