public Builder setRecipient(JOutPiqi.recipient value) {
        if (recipientBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          recipient_ = value;
          onChanged();
        } else {
          recipientBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000001;
        return this;
      }