Interview: Design an iterator for a collection of collections

Question

Design an iterator for a collection of collections in java. The iterator should hide the nesting, allowing you to iterate all of the elements belonging to all of the collect

Answer 1

First, take a look at the implementation of the iterator in java.util.LinkedList

http://www.docjar.com/html/api/java/util/LinkedList.java.html

From there your task is easy just implement a single iterator that takes into account the fact that it is iterating over collections.

Regards.