Collection which can be increased or reduced at runtime while iterating. Iterators returned by this implementation are consistent - it is guaranteed that {@link Iterator#next()} will obey the result of the previously called{@link Iterator#hasNext()} even though the collection content has beenmodified. This collection is thread-safe with the condition that there is at most one writing thread at a point in time. There are no restrains on the number of readers.
@author Costin Leau
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