Available on all platforms
An Iterator is a structure that permits iteration over elements of type T.
Any class with matching hasNext and next fields is considered an Iterator and can then be used e.g. in for-loops. This makes it easy to implement custom iterators.
Returns the current item of the Iterator and advances to the next one.
This method is not required to check
hasNext first. A call to this
hasNext is false yields unspecified behavior.
On the other hand iterators should not require a call to
before the first call to
next if an element is available.