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Provides access to system-related information and resources including standard
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This class provides methods that return pseudo-random values.It is dangerous to
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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
for a Web site. A sub
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Is the value null?
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