code: public static void write(byte b, OutputStream os) {
          try {
              os.write(b);
          } catch (IOException e) {
              throw E.ioException(e);
          }
      }
docs: Write a byte into outputstream.
  
  The outputstream is not closed after written.
  
  @param b
  the byte to be written
  @param os
  the output stream into which the byte is written