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A concrete subclass of NumberFormat that formats decimal numbers. It has a
variety of features desig
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HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
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This class provides methods that return pseudo-random values.It is dangerous to
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TreeSet is an implementation of SortedSet. All optional operations (adding and
removing) are support
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A reentrant mutual exclusion Lock with the same basic behavior and semantics as
the implicit monitor
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