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Return the contained value, if present, otherwise throw an exception to be
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A ConnectException is thrown if a connection cannot be established to a remote
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Thrown when a hostname can not be resolved.
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An iterator over a sequence of objects, such as a collection.If a collection has
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A Set is a data structure which does not allow duplicate elements.
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
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An ExecutorService that executes each submitted task using one of possibly
several pooled threads, n
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