Convert JSONObject to List or a String to List

Question

I submit a query from my Java application, which upon running on Elasticsearch server returns the result in the form of a string. I want the result as a list of JSONObject objects. I can convert the string to a JSONObject using JSONObject jsonResponse = new JSONObject(responseString).

Is there any method by which I can get this in the form of a List<JSONObject>?

@trololo : The solution here does not give the answer to my question . I just need a simple, direct conversion to List , not an array . — Aishwarya Garg, Jul 27 '15 at 09:44

Victor Dodon · Accepted Answer · 2015-07-27T10:18:30.063

5

Instead of using JSONObject you may use JSONArray. If you really need to convert it to a List you may do something like:

List<JSONObject> list = new ArrayList<JSONObject>();
try {
    int i;
    JSONArray array = new JSONArray(string);
    for (i = 0; i < array.length(); i++)
        list.add(array.getJSONObject(i);
} catch (JSONException e) {
    System.out.println(e.getMessage());
}

edited Jul 27 '15 at 10:18

answered Jul 27 '15 at 09:44

Victor Dodon

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Is there not a method specifically for List and not ArrayList ? – Aishwarya Garg Jul 27 '15 at 10:09
1

@AishwaryaGarg I have updated the answer. List> is just an interface. – Victor Dodon Jul 27 '15 at 10:20
1

I get the error that " The method add(org.json.JSONObject) in the type List is not applicable for the arguments (com.amazonaws.util.json.JSONObject) " upon using the above code. – Aishwarya Garg Jul 27 '15 at 10:32

score 0 · Answer 2 · edited May 23 '17 at 12:14

0

There is an answer of your question: https://stackoverflow.com/a/17037364/1979882

ArrayList<String> listdata = new ArrayList<String>();     
JSONArray jArray = (JSONArray)jsonObject; 
if (jArray != null) { 
   for (int i=0;i<jArray.length();i++){ 
    listdata.add(jArray.get(i).toString());
   } 
}

edited May 23 '17 at 12:14

Community

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1

answered Jul 27 '15 at 09:41

Vyacheslav

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Is there not a method specifically for List and not ArrayList ? – Aishwarya Garg Jul 27 '15 at 10:09
List is an interface. You can use List listdata instead of ArrayList listdata – Vyacheslav Jul 27 '15 at 10:34

score 0 · Answer 3 · edited Nov 14 '19 at 17:27

This method is really easy and works too

try {

    JSONObject jsonObject = new JSONObject(THESTRINGHERE);
    String[] names = JSONObject.getNames(jsonObject);
    JSONArray jsonArray = jsonObject.toJSONArray(new JSONArray(names));

    ArrayList<String> listdata = new ArrayList<String>();     
    JSONArray jArray = (JSONArray)jsonArray; 
    if (jArray != null) { 
       for (int i=0;i<jArray.length();i++){ 
           listdata.add(jArray.get(i).toString());
       } 
    } 
    //  System.out.println(listdata);


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

Convert JSONObject to List or a String to List

3 Answers3