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Iterator<E> iterator()

Note

Java 8 introduces Spliterator for parallel processing of a collection.
What is the difference between fail-fast and fail-safe iterators?
Ans : Iterators for different collections are either fail-fast or fail-safe, depending on how they react to concurrent modifications. The concurrent modification is not only a modification of collection from another thread but also modification from the same thread but using another iterator or modifying the collection directly.