Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to
Iterator.next()
.
The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method, unless an overriding class has specified a concurrent modification policy.
The behavior of an iterator is unspecified if this method is called after a call to the forEachRemaining
method.