Filter JSONArray using attribute of JSONObject

Filter JSONArray

    private ArrayList<JSONObject> getFilteredList(JSONArray options){

        Map<String, JSONObject> map = new ArrayMap<>();

        for (int i = 0; i < options.length(); i++){
            try {
                JSONObject object = options.getJSONObject(i);
                String key = object.getString("Order_Type__c") + object.getString("Opp_SFID__c");

                if (!map.containsKey(key)){
                    map.put(key, object);
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return new ArrayList<JSONObject>(map.values());
    }