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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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Thrown when a program encounters the end of a file or stream during an input
operation.
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A Uniform Resource Locator that identifies the location of an Internet resource
as specified by RFC
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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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This class provides methods that return pseudo-random values.It is dangerous to
seed Random with the
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Walk the nodes of the tree left-to-right or right-to-left. Note that in
descending iterations, next
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