public interface CloseableIterator<E>
extends java.io.Closeable, java.util.Iterator<E>
Iterator and Closeable interfaces. This is
useful when you have data that must be iterated on and may hold resources in the underlying implementation that
must be closed.
Some implementations may close resources automatically when the iterator is finished being iterated on however
this is an implementation detail and all callers should call Closeable.close() method to be
sure all resources are freed properly.