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This class generates cryptographically secure pseudo-random numbers. It is best
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Calendar is an abstract base class for converting between a Date object and a
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An iterator over a sequence of objects, such as a collection.If a collection has
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XPath provides access to the XPath evaluation environment and expressions.
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General IO stream manipulation utilities. This class provides static utility
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A Window object is a top-level window with no borders and no menubar. The
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