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Return the contained value, if present, otherwise throw an exception to be
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The BitSet class implements abit array [http://en.wikipedia.org/wiki/Bit_array].
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HashSet is an implementation of a Set. All optional operations (adding and
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This class provides methods that return pseudo-random values.It is dangerous to
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Vector is an implementation of List, backed by an array and synchronized. All
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A TimeUnit represents time durations at a given unit of granularity and provides
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General file manipulation utilities. Facilities are provided in the following
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