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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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A connection represents a link from a Java application to a database. All SQL
statements and results
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Formats and parses dates in a locale-sensitive manner. Formatting turns a Date
into a String, and pa
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HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported.
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An iterator over a sequence of objects, such as a collection.If a collection has
been changed since
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A task that returns a result and may throw an exception. Implementors define a
single method with no
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General IO stream manipulation utilities. This class provides static utility
methods for input/outpu
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