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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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An exception that indicates a failed JDBC operation. It provides the following
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A Set is a data structure which does not allow duplicate elements.
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The TimerTask class represents a task to run at a specified time. The task may
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This is the central class in the log4j package. Most logging operations, except
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