Iterator.remove() is safe, you can use it like this:

List<String> list = new ArrayList<>();

// This is a clever way to create the iterator and call iterator.hasNext() like

// you would do in a while-loop. It would be the same as doing:

//     Iterator<String> iterator = list.iterator();

//     while (iterator.hasNext()) {

for (Iterator<String> iterator = list.iterator(); iterator.hasNext();) {

    String string = iterator.next();

    if (string.isEmpty()) {

        // Remove the current element from the iterator and the list.

        iterator.remove();

    }

}

Note that Iterator.remove is the only safe way to modify a collection during iteration; the behavior is unspecified if the underlying collection is modified in any other way while the iteration is in progress