A DESCRIPTION OF THE PROBLEM :
java.util.AutoClosableIterator: An interface that implement Iterator and AutoClosable. It is automatically closed by a for-each loop in the case of break, return, exception, and completion (and any other scenario in which the loop exits that I have not thought of).

Of course it would be closed by a try-with-resources block as well since it implements AutoClosable.

This feature would make possible, iterators which use non heap resources like files or threads.