The method `java.io.BufferedOutputStream.flush()` is used in Java to flushes the internal buffer of a `BufferedOutputStream` object. Flushing means that any data remaining in the buffer is written to the underlying output stream. This ensures that data is immediately written rather than waiting for the buffer to fill up. Flushing a `BufferedOutputStream` is useful when it is necessary to write data in real-time or when closing the stream.
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