json assembled empty list, object

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
 
public class FastJsonArrayTest {
    public static void main(String[] args) {
        JSONObject jo = new JSONObject();
        jo.put("name", null);
        jo.put("age", 123);
        jo.put("list", new JSONArray());
        jo.put("obj", new JSONObject());
        System.out.println(jo.toJSONString());
    }
}

 

Print Results:

{"age":123,"list":[],"obj":{}}

 

Original link: https: //blog.csdn.net/tengdazhang770960436/article/details/48930661