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Return the contained value, if present, otherwise throw an exception to be
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An output stream that writes bytes to a file. If the output file exists, it can
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Calendar is an abstract base class for converting between a Date object and a
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The TimerTask class represents a task to run at a specified time. The task may
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Factory that creates instances of DateTimeFormatter from patterns and styles.
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A Window object is a top-level window with no borders and no menubar. The
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