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Return the contained value, if present, otherwise throw an exception to be
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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
can be registered w
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Defines methods that all servlets must implement. A servlet is a small Java
program that runs within
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This is the central class in the log4j package. Most logging operations, except
configuration, are d
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A Rectangle specifies an area in a coordinate space that is enclosed by the
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