Iterating/Getting JSONObject inside of JSONArray without key

Question

Need to get the Every JSONObject inside this JSONArray. Currently there is only 2 JSONObjects are there but there will be more in the future. So, i need to make it dynamic based on length of the JSONArray.

Here is the whole JSON:

{
  "data": [
    {
      "previous_class_percentage": 58.0,
      "speech_disabilty": true,
      "hearing_difficulty": false,
      "last_name": "Krishnana",
      "weight": 54.0,
      "submitted_timestamp": "2018-02-15T10:22:00Z",
      "id_number": "VS017BH0004"
    },
    {
      "previous_class_percentage": 88.0,
      "speech_disabilty": true,
      "hearing_difficulty": false,
      "last_name": "Krishnana",
      "weight": 54.0,
      "submitted_timestamp": "2018-02-14T10:22:00Z",
      "id_number": "VS017BH0006"
    }
  ]
}

I am trying something like this

  try {
                        int k = 0;
                        while (i<sectionJsonArr.length()){
                            JSONObject data = sectionJsonArr.optJSONObject(k);
                            Log.d("json-array",data+"");
                            String b_certificate_no = data.getString("id_number");
                            if (student_birth_certfct_number.equals(b_certificate_no)){
                                Log.d("text","inside if");
                                //TO-DO CODE
                            }
                            k++;
                        }
                    }catch (JSONException e){
                        e.printStackTrace();
                    }

Answer 1

try{
    for( int i=0; i < sectionJsonArr.length(); i++){
      JSONObject data = obj.optJSONObject(i);
      Log.d("json-array",data+"");
      String b_certificate_no = data.getString("id_number");
      if (student_birth_certfct_number.equals(b_certificate_no)){
         Log.d("text","inside if");
             //TO-DO CODE
      }
    }
}catch(JSONException e){
  e.printStackTrace();
}

this is also a way to do that