public Builder mergeFrom(JSystemPiqi.buy_item_request other) {
        if (other == JSystemPiqi.buy_item_request.getDefaultInstance()) return this;
        if (other.hasUserid()) {
          setUserid(other.getUserid());
        }
        if (other.hasShopItemId()) {
          setShopItemId(other.getShopItemId());
        }
        if (other.hasAmount()) {
          setAmount(other.getAmount());
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
      }