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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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Note: Do not use this class since it is obsolete. Please use the Map interface
for new implementatio
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A map that has its keys ordered. The sorting is according to either the natural
ordering of its keys
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TreeSet is an implementation of SortedSet. All optional operations (adding and
removing) are support
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Factory and utility methods for Executor, ExecutorService,
ScheduledExecutorService, ThreadFactory,
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Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
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