Forcing Updates to a File to the Disk

   
import java.io.FileDescriptor;
import java.io.FileOutputStream;

public class Main {
  public static void main(String[] argv) throws Exception {
    FileOutputStream os = new FileOutputStream("outfilename");
    FileDescriptor fd = os.getFD();
    os.write(1);
    os.flush();
    fd.sync();
  }
}

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Forcing Updates to a File to the Disk : Files « File Input Output « Java

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