Fail Safe vs Fail Fast Iterator

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* When we are iterating the collections, and at the same time if we are modify the collection, then it will throw uninterepted exception.  This is Called Failed Fast Iterator.

* But it will not throw the error for above use case, that is called Fail Safe Iterator.

Eg for Fail Safe Iterator,

CopyOnWriteArrayList, ConcurrentHashMap - These are synchronized. So it will not throw error

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