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Return the contained value, if present, otherwise throw an exception to be
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Signals a general, I/O-related error. Error details may be specified when
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Wraps either an existing OutputStream or an existing Writerand provides
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A legacy iteration interface.New code should use Iterator instead. Iterator
replaces the enumeration
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A PriorityQueue holds elements on a priority heap, which orders the elements
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An Executor that provides methods to manage termination and methods that can
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