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Return the contained value, if present, otherwise throw an exception to be
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Allows reading from and writing to a file in a random-access manner. This is
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This class generates cryptographically secure pseudo-random numbers. It is best
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GregorianCalendar is a concrete subclass of Calendarand provides the standard
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An Executor that provides methods to manage termination and methods that can
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Factory and utility methods for Executor, ExecutorService,
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This is the main interface of a Quartz Scheduler. A Scheduler maintains a registry of org.quartz.Job
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