How to create JSON Object using String?

Question

I want to create a JSON Object using String.

Example : JSON {"test1":"value1","test2":{"id":0,"name":"testName"}}

In order to create the above JSON I am using this.

String message; JSONObject json = new JSONObject();  json.put("test1", "value1");  JSONObject jsonObj = new JSONObject();  jsonObj.put("id", 0); jsonObj.put("name", "testName"); json.put("test2", jsonObj);  message = json.toString(); System.out.println(message); 

I want to know how can I create a JSON which has JSON Array in it.

Below is the sample JSON.

{   "name": "student",    "stu": {     "id": 0,     "batch": "batch@"   },   "course": [     {       "information": "test",       "id": "3",       "name": "course1"     }   ],   "studentAddress": [     {       "additionalinfo": "test info",       "Address": [         {           "H.No": "1243",           "Name": "Temp Address",           "locality": "Temp locality",            "id":33                   },         {            "H.No": "1243",           "Name": "Temp Address",           "locality": "Temp locality",             "id":33                            },                 {            "H.No": "1243",           "Name": "Temp Address",           "locality": "Temp locality",             "id":36                            }       ], "verified": true,     }   ] } 

Thanks.

Answer 1

JSONArray may be what you want.

String message; JSONObject json = new JSONObject(); json.put("name", "student");  JSONArray array = new JSONArray(); JSONObject item = new JSONObject(); item.put("information", "test"); item.put("id", 3); item.put("name", "course1"); array.put(item);  json.put("course", array);  message = json.toString();  // message // {"course":[{"id":3,"information":"test","name":"course1"}],"name":"student"} 

Answer 2

In contrast to what the accepted answer proposes, the documentation says that for JSONArray() you must use put(value) no add(value).

https://developer.android.com/reference/org/json/JSONArray.html#put(java.lang.Object)

(Android API 19-27. Kotlin 1.2.50)