Java loop over Json array?

Question

I am trying to loop over the following JSON

{     "dataArray": [{         "A": "a",         "B": "b",         "C": "c"     }, {         "A": "a1",         "B": "b2",         "C": "c3"     }] } 

What i got so far:

JSONObject jsonObj = new JSONObject(json.get("msg").toString());  for (int i = 0; i < jsonObj.length(); i++) {     JSONObject c = jsonObj.getJSONObject("dataArray");      String A = c.getString("A");     String B = c.getString("B");     String C = c.getString("C");  } 

Any ideas?

Answer 1

In your code the element dataArray is an array of JSON objects, not a JSON object itself. The elements A, B, and C are part of the JSON objects inside the dataArray JSON array.

You need to iterate over the array

public static void main(String[] args) throws Exception {     String jsonStr = "{         \"dataArray\": [{              \"A\": \"a\",                \"B\": \"b\",               \"C\": \"c\"            }, {                \"A\": \"a1\",              \"B\": \"b2\",              \"C\": \"c3\"           }]      }";      JSONObject jsonObj = new JSONObject(jsonStr);      JSONArray c = jsonObj.getJSONArray("dataArray");     for (int i = 0 ; i < c.length(); i++) {         JSONObject obj = c.getJSONObject(i);         String A = obj.getString("A");         String B = obj.getString("B");         String C = obj.getString("C");         System.out.println(A + " " + B + " " + C);     } } 

prints

a b c a1 b2 c3 

I don't know where msg is coming from in your code snippet.