I have to sort a JSON array which contains JSON objects. The structure of the JSON is like the following:

[
  {
    "id": 582,
    "isTransaction": false,
    "toDate": "2015-08-26 16:12:00.0",
    "fromDate": "2015-08-24 15:11:00.0",
    "status": "REQUEST_ACCEPTED_BY_BOTH_SIDES"
  },
  {
    "id": 602,
    "isTransaction": false,
    "toDate": "2015-08-21 21:52:00.0",
    "fromDate": "2015-08-20 23:53:00.0",
    "status": "REQUEST_ACCEPTED_BY_BOTH_SIDES"
  }, {
    "carFk": 1,
    "endMileage": 1455,
    "ownerName": "Celien",
    "model": "335i",
    "status": "DRIVER_SET_ODOMETER",
    "ownerId": 1,
    "toDate": "2015-08-26 16:12:00.0",
    "startMileage": 455,
    "id": 421,
    "fromDate": "2015-08-24 15:11:00.0",
    "isTransaction": true,
    "brand": "Bmw",
    "driverName": "Damien",
    "exchange": false
  }
]

What I have to do is to delete all The JSONObjects which have the same fromDate field. If two object have this same field, then I would like to keep the one which contains the field isTransaction:true

Here is the algorithm I wrote:

 private void addOnlyRequestOrTransactionIntoListView(JSONArray array) {
        JSONArray copyArray = array;
        JSONArray resultArray = new JSONArray();

        int i = 0, j = 0;
        try {
            while(i < array.length()){
                JSONObject temp = array.getJSONObject(i);
                j = 0;
                while(j < copyArray.length()){
                    if(temp.getString("fromDate").equals(array.getJSONObject(j).getString("fromDate")))
                        if(temp.getBoolean("isTransaction"))
                            resultArray.put(temp);                             
                    j++;
                }
                i++;
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
}

But it does not what I want to performed. Can you give me some clues? Thanks!