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A specific moment in time, with millisecond precision. Values typically come
from System#currentTime
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GregorianCalendar is a concrete subclass of Calendarand provides the standard
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Walk the nodes of the tree left-to-right or right-to-left. Note that in
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An object that executes submitted Runnable tasks. This interface provides a way
of decoupling task s
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A reentrant mutual exclusion Lock with the same basic behavior and semantics as
the implicit monitor
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