import java.util.*;

class TestListIterator {

public static void main(String[] args) {

List<Integer> l1 = new ArrayList<>();

l1.add(1);

l1.add(3);

l1.add(5);

l1.add(7);

l1.add(9);

ListIterator<Integer> iter = l1.listIterator();

System.out.println("Traversing the list in forward direction:");

while (iter.hasNext()) {

System.out.println(iter.nextIndex() + ": " + iter.next());

}

System.out.println("\nTraversing the list in backward direction:");

//If without previous iteration, we should create iter like this:

//iter = l1.listIterator(l1.size()), so that iter points to the position

//right after the last element.

while (iter.hasPrevious()){

System.out.println(iter.previousIndex() + ": " + iter.previous());

}

System.out.println("\nAdding an element while iterating: ");

while (iter.hasNext()) {

if (iter.nextIndex() == 2) {

iter.add(4);

}

System.out.println(iter.nextIndex() + ": " + iter.next());

}

System.out.println("After inserting 4 after the second element: " + l1);

System.out.println("\nRemoving an element while iterating: ");

iter = l1.listIterator();

while (iter.hasNext()) {

int id = iter.nextIndex();

int cur = iter.next();

if (cur == 4) {

iter.remove();

}

System.out.println(id + ": " + cur);

}

System.out.println("After removing 4 from the list: " + l1);

}

}