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Return the contained value, if present, otherwise throw an exception to be
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An "abstract" representation of a file system entity identified by a pathname.
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Wraps either an existing OutputStream or an existing Writerand provides
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A synchronization aid that allows one or more threads to wait until a set of
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Factory and utility methods for Executor, ExecutorService,
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Provides an abstract class to be subclassed to create an HTTP servlet suitable
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The BufferedImage subclass describes an java.awt.Image with an accessible buffer
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