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Return the contained value, if present, otherwise throw an exception to be
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A specialized Reader that reads from a file in the file system. All read
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This class generates cryptographically secure pseudo-random numbers. It is best
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Formats and parses dates in a locale-sensitive manner. Formatting turns a Date
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Doubly-linked list implementation of the List and Dequeinterfaces. Implements
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Is the value null?
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