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Return the contained value, if present, otherwise throw an exception to be
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Wraps either an existing OutputStream or an existing Writerand provides
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Provides access to system-related information and resources including standard
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A controller for the selection of SelectableChannel objects. Selectable channels
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An interface for an object which represents a database table entry, returned as
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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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General file manipulation utilities. Facilities are provided in the following
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