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A legacy iteration interface.New code should use Iterator instead. Iterator
replaces the enumeration
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HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
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A parser that parses a text string of primitive types and strings with the help
of regular expressio
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A java.util.Queue that additionally supports operations that wait for the queue
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Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
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The Modifier class provides static methods and constants to decode class and
member access modifiers
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