Web Reference: Dec 11, 2018 ยท The iterator () method of ArrayList class in Java Collection Framework is used to get an iterator over the elements in this list in proper sequence. The returned iterator is fail-fast. Definition and Usage The iterator() method returns an Iterator for the list. To learn how to use iterators, see our Java Iterator tutorial. The size, isEmpty, get, set, iterator, and listIterator operations run in constant time. The add operation runs in amortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for the LinkedList implementation.
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