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GregorianCalendar is a concrete subclass of Calendarand provides the standard
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A TimeUnit represents time durations at a given unit of granularity and provides
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This class provides access to implementations of cryptographic ciphers for
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This is the central class in the log4j package. Most logging operations, except
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Is the value null?
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A filter is an object that performs filtering tasks on either the request to a
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