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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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A controller for the selection of SelectableChannel objects. Selectable channels
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Calendar is an abstract base class for converting between a Date object and a
set of integer fields
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A task that returns a result and may throw an exception. Implementors define a
single method with no
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An Executor that provides methods to manage termination and methods that can
produce a Future for tr
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Provides an abstract class to be subclassed to create an HTTP servlet suitable
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