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Return the contained value, if present, otherwise throw an exception to be
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ObjectMapper provides functionality for reading and writing JSON, either to and
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A connection represents a link from a Java application to a database. All SQL
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The base class for all formats. This is an abstract base class which specifies
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Factory and utility methods for Executor, ExecutorService,
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This Graphics2D class extends the Graphics class to provide more sophisticated
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A Window object is a top-level window with no borders and no menubar. The
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