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Return the contained value, if present, otherwise throw an exception to be
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A specialized Reader that reads from a file in the file system. All read
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A Uniform Resource Identifier that identifies an abstract or physical resource,
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A Set is a data structure which does not allow duplicate elements.
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The TimerTask class represents a task to run at a specified time. The task may
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Factory and utility methods for Executor, ExecutorService,
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A generic Abstract Window Toolkit(AWT) container object is a component that can
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