java.util package has public interface Iterator. Iterator can be defined as interface which belongs to collection framework. Iterator as name suggest allows accessing,removing and traversing data ...

the order of elements returned by next should be: [1,4,6]. * // This is the interface that allows for creating nested lists.

Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Example 1: Given the list ...