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Return the contained value, if present, otherwise throw an exception to be
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A connection to a URL for reading or writing. For HTTP connections, see
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A buffer for bytes. A byte buffer can be created in either one of the following
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A controller for the selection of SelectableChannel objects. Selectable channels
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Uses a one-way hash function to turn an arbitrary number of bytes into a
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A task that returns a result and may throw an exception. Implementors define a
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A TimeUnit represents time durations at a given unit of granularity and provides
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