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Return the contained value, if present, otherwise throw an exception to be
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GregorianCalendar is a concrete subclass of Calendarand provides the standard
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A PriorityQueue holds elements on a priority heap, which orders the elements
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A java.util.Queue that additionally supports operations that wait for the queue
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An interface for the creation of Connection objects which represent a connection
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A Window object is a top-level window with no borders and no menubar. The
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