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Return the contained value, if present, otherwise throw an exception to be
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Formats and parses dates in a locale-sensitive manner. Formatting turns a Date
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Calendar is an abstract base class for converting between a Date object and a
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Collection is the root of the collection hierarchy. It defines operations on
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SortedSet is a Set which iterates over its elements in a sorted order. The order
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Extends the javax.servlet.ServletRequest interface to provide request
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