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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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An interface for an object which represents a database table entry, returned as
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This class provides methods that return pseudo-random values.It is dangerous to
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A synchronization aid that allows one or more threads to wait until a set of
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Defines a general exception a servlet can throw when it encounters difficulty.
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