Which strings will be resolved to null by fastjason?

from ：

Which strings will be FastJson It can be interpreted as null Well ?

fastjson brief introduction

fastjson It's Alibaba's open source JSON analysis 
 It can parse JSON Format string 
 Support will Java Bean Serialize to JSON character string 
 You can also get it from JSON Deserialize string to JavaBean

---

 Below, the author will talk about the string will be FastJson It can be interpreted as null Description of , As shown below :  example :

public static void main(String[] args) {
  String sourceStr = "";
  JSONObject jsonObject = JSONObject.parseObject(sourceStr);
  System.out.println(jsonObject);
}

 When sourceStr by null Or empty string 
jsonObject Will be interpreted as null