fastjson和 gson 的反序列化的一个差异

public class Response01 {
    private ThirdData thirdData;
     
    public ThirdData getThirdData(){
            return thirdData;
     
   }
    
    // ThirdData extend BaseThirdData
    public void setThirdData(BaseThirdData thirdData){
        this.thirdData=thirdData;
        
   }
}

fastjson:

     Gson GSON= new Gson();

    GSON.fromJson(jsonString,clazz);

    尽管setThirdData（BaseThirdData ）但是可以反序列化到ThirdData

gson:

 JSONObject.parseObject(jsonString,clazz);

 只能反序列化到BaseThirdData，即尽管jsonString 里面有ThirdData的字段，但是只能反序列化BaseThirdData