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Iterator
// the following is the Iterator interface
public interface Iterator<E> {
boolean hasNext();
E next();
void remove(); //optional
}//the following method shows you how to use an Iterator to filter
//an arbitrary Collection:
static void filter(Collection<?> c) {
for (Iterator<?> it = c.iterator(); it.hasNext(); )
if (!cond(it.next()))
it.remove();
}An Iterator is an object that enables you to traverse through a collection and to remove elements from the collection selectively, if desired. You get an Iterator for a collection by calling its iterator method.
Use Iterator instead of the for-each construct when you need to: remove the current element; iterate over multiple collections in parallel.