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Return the contained value, if present, otherwise throw an exception to be
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Wraps an existing Writer and buffers the output. Expensive interaction with the
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A concrete subclass of NumberFormat that formats decimal numbers. It has a
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A parser that parses a text string of primitive types and strings with the help
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A task that returns a result and may throw an exception. Implementors define a
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A Handler object accepts a logging request and exports the desired messages to a
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