@Override
    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
      if (level_ != LEVEL.C1.getNumber()) {
        size += com.google.protobuf.CodedOutputStream
          .computeEnumSize(1, level_);
      }
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, id_);
      }
      if (years_ != 0) {
        size += com.google.protobuf.CodedOutputStream
          .computeInt32Size(3, years_);
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSize = size;
      return size;
    }
<code>int32 years = 3;</code>
@return The years.
core/src/test/java/com/alibaba/fastjson2/dubbo/GoogleProtobufBasic.java