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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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This class generates cryptographically secure pseudo-random numbers. It is best
to invoke SecureRand
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Calendar is an abstract base class for converting between a Date object and a
set of integer fields
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A specific moment in time, with millisecond precision. Values typically come
from System#currentTime
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Vector is an implementation of List, backed by an array and synchronized. All
optional operations in
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The Modifier class provides static methods and constants to decode class and
member access modifiers
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