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An iterator is an object-oriented programming pattern which for the most part functions similarly to a pointer to an object inside a collection with the added ability to traverse through the collection in a defined manner, agnostic of the actual implementation or even object addresses in physical memory. Iterators may be further limited in particular traversal directions.

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Flatten iterator for nested list

Your code can end up with StackOverflow exception when you add self reference to the list. List list = new ArrayList(); list.add(list); FlattenIterator flattenIterator = new FlattenIterator(list); wh …
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