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Return the contained value, if present, otherwise throw an exception to be
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Provides access to system-related information and resources including standard
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Formats or parses dates and times.This class provides factories for obtaining
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The base class for all formats. This is an abstract base class which specifies
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Stack is a Last-In/First-Out(LIFO) data structure which represents a stack of
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Vector is an implementation of List, backed by an array and synchronized. All
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