How to create JSON Object using String?

I want to create a JSON Object using String.

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

"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.

2 Answers
2

JSONArray may be what you want.

JSONArray

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.add(item);

json.put("course", array);

message = json.toString();

// message
// "course":["id":3,"information":"test","name":"course1"],"name":"student"


JSONObject

JSONObject jsonObj = new JSONObject("your_json_string");

JSONObject("["foo":2, "bar": 3]");

A JSONObject text must begin with '{' at 1 [character 2 line 1]

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

put(value)

add(value)

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

(Android API 19-27. Kotlin 1.2.50)

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