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Return the contained value, if present, otherwise throw an exception to be
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A specialized Reader that reads from a file in the file system. All read
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Calendar is an abstract base class for converting between a Date object and a
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This class consists exclusively of static methods that operate on or return
collections. It contains
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A legacy iteration interface.New code should use Iterator instead. Iterator
replaces the enumeration
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An int value that may be updated atomically. See the java.util.concurrent.atomic
package specificati
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Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
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