Iterators - Algorithms

Iterator
- T next; boolean done
- Call hasNext() in next
- Corner case: whether element can be null


Google – Non Null Iterator

Google – Jump Iterator
- next() returns iterator.next().next()
- T current


- Integer next; boolean done


Google – Run Length Encoding Iterator - 4a2b3c
- Character curr; int cnt; int index;


- Iterator curr; maintain current iterator

- cur_iterator, it1, it2
- LinkedList listIt

if (item instanceof Collection) {
 stack.push(((Collection) item).iterator());
}

LeeCode 341 - Flatten Nested List Iterator
- keep an additional field storing the next integer
- Stack> stack, Integer nextInteger

- Stack stack; addAllLeftNodes

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