public Builder clear() {
        super.clear();
        if (buyItemBuilder_ == null) {
          buyItem_ = JSystemPiqi.buy_item_request.getDefaultInstance();
        } else {
          buyItemBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000001);
        if (grantCoinsBuilder_ == null) {
          grantCoins_ = JSystemPiqi.grant_coins_request.getDefaultInstance();
        } else {
          grantCoinsBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000002);
        return this;
      }