I want to put JSONObject into JSONArray inside for loop

Question

  try {
        jsonObjectt.put("senderId", "XYZ");
        jsonObjectt.put("User_Type", usertype);
        jsonObjectt.put("Text_message", message);


           for(int i=0; i<=selectedUserIdListArray.size(); i++) {
              try { 
                  jsonObject.put("Stud_ID", selectedUserIdListArray.get(i));
                  jsonObject.put("Mobile_No", selectedUserNoListArray.get(i));
                  jsonArray.put(jsonObject);
              }catch (Exception e){
                  e.printStackTrace();
              }
           }
          jsonObjectt.put("studData",jsonArray);      


    } catch (JSONException e) {
        e.printStackTrace();
    }

what i expect :

   {
      "senderId":"XYZ",
      "User_Type":"student",
      "Text_message":"jgz ",
      "studData": [{
                    "Stud_ID":"100S1000","Mobile_No":"123456789"
                   },
                   {
                    "Stud_ID":"100S1010","Mobile_No":"321654987"
                   }]
    }

what i am getting:

   {
      "senderId":"XYZ",
      "User_Type":"student",
      "Text_message":"jgz ",
      "studData": [{
                    "Stud_ID":"100S1000","Mobile_No":"123456789"
                   },
                   {
                    "Stud_ID":"100S1000","Mobile_No":"123456789"
                   }]
    }

@patil why you want that? directly convert your json into pojo that makes your life eaisy. — sushildlh
– sushildlh, Commented Feb 5, 2021 at 6:28

Raj Raj · Accepted Answer · 2021-02-05 06:57:39Z

Instead jsonArray.put can you try with jsonArray.add

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class JSONPractise {
    public static void main(String[] args) {
        JSONObject jsonObjectt = new JSONObject();
        List<Student> selectedUserIdListArray = new ArrayList<>();
        selectedUserIdListArray.add(new Student("100S1000", "1234567890"));
        selectedUserIdListArray.add(new Student("100S1010", "3216549870"));
        JSONArray jsonArray = new JSONArray();
        try {
            jsonObjectt.put("senderId", "XYZ");
            jsonObjectt.put("User_Type", "student");
            jsonObjectt.put("Text_message", "xzf");


            for(int i=0; i<selectedUserIdListArray.size(); i++) {
                try {
                    JSONObject jsonObject = new JSONObject();
                    jsonObject.put("Stud_ID", selectedUserIdListArray.get(i).getId());
                    jsonObject.put("Mobile_No", selectedUserIdListArray.get(i).getPhoneNumber());
                    jsonArray.add(jsonObject);
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            jsonObjectt.put("studData",jsonArray);

            System.out.println(jsonObjectt);
        }catch (Exception e)
        {
            System.out.println(e);
        }
    }
}

Output:

{
   "senderId":"XYZ",
   "studData":[
      {
         "Mobile_No":"1234567890",
         "Stud_ID":"100S1000"
      },
      {
         "Mobile_No":"3216549870",
         "Stud_ID":"100S1010"
      }
   ],
   "Text_message":"xzf",
   "User_Type":"student"
}

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