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A specialized Writer that writes to a file in the file system. All write
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A legacy iteration interface.New code should use Iterator instead. Iterator
replaces the enumeration
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A map that has its keys ordered. The sorting is according to either the natural
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
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A reentrant mutual exclusion Lock with the same basic behavior and semantics as
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