​

public class prog {

    public static void main(String[] args) {

        LinkedList<Integer> lnkList = new LinkedList<Integer>();

        lnkList.add(4);

        lnkList.add(2);

        lnkList.add(3);

        lnkList.add(1);

        ListIterator<Integer> iter = lnkList.listIterator();

        while (iter.hasNext()) {

            System.out.print(iter.next() + " ");

        }

        System.out.println();

        while (iter.hasPrevious()) {

            System.out.print(iter.previous() + " ");

        }

    }

}