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Return the contained value, if present, otherwise throw an exception to be
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A specialized Writer that writes to a file in the file system. All write
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An immutable arbitrary-precision signed decimal.A value is represented by an
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GregorianCalendar is a concrete subclass of Calendarand provides the standard
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XPath provides access to the XPath evaluation environment and expressions.
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General file manipulation utilities. Facilities are provided in the following
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