Iterator has .next() - is there a way to get the previous element instead of the next one?

Question

I have an Iterator that I use on a HashMap, and I save and load the iterator. is there a way to get the previous key in the HashMap with Iterator? (java.util.Iterator)

Update

I save it as an attribute in a Red5 connection and then load it back to continue working where i stopped.

Another update

I'm iterating through the keyset of the HashMap

Answer 1

You can use ListIterator instead of Iterator. ListIterator has previous() and hasPrevious() methods.

Answer 2

Not directly, as others pointed out, but if you e.g. need to access one previous element you could easily save that in a separate variable.

T previous = null;
for (Iterator<T> i = map.keySet().iterator(); i.hasNext();) {
    T element = i.next();

    // Do something with "element" and "previous" (if not null)

    previous = element;
}