The java.util.PrintWriter.flush() method is used to flush the output stream. It clears any buffered output and writes any remaining data to the underlying stream. This method ensures that all data written by the PrintWriter is immediately sent to the destination. Flushing is important when it is necessary to make sure that data is written completely and not left in the buffer. This method is typically called after writing data to the PrintWriter, especially when using network streams or writing to a file.
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