public Builder clear() {
        super.clear();
        ok_ = false;
        bitField0_ = (bitField0_ & ~0x00000001);
        if (errorBuilder_ == null) {
          error_ = JSystemPiqi.system_error.getDefaultInstance();
        } else {
          errorBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000002);
        return this;
      }