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An output stream that writes bytes to a file. If the output file exists, it can
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Signals a general, I/O-related error. Error details may be specified when
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KeyStore is responsible for maintaining cryptographic keys and their owners.
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The TimerTask class represents a task to run at a specified time. The task may
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
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A Window object is a top-level window with no borders and no menubar. The
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