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Return the contained value, if present, otherwise throw an exception to be
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An immutable arbitrary-precision signed decimal.A value is represented by an
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Provides a client-side TCP socket.
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Legacy security code; do not use.
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Calendar is an abstract base class for converting between a Date object and a
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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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