public Builder setId(int value) {
        bitField0_ |= 0x00000002;
        id_ = value;
        onChanged();
        return this;
      }
<code>optional int32 id = 2;</code>
@param value The id to set.
@return This builder for chaining.
core/src/test/java/com/alibaba/fastjson2/protobuf/PersonOuterClass.java