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Return the contained value, if present, otherwise throw an exception to be
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GregorianCalendar is a concrete subclass of Calendarand provides the standard
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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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Main entry-point into the library.
Options represents a collection of Option objects, which describ
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