How to separate and identify objects within an Ajax request, with data coming from Servlet via Json?

Question

How do I separate the objects inside the Ajax? The Servlet sends a list of objects to Ajax, but I can’t separate them inside the Ajax to be able to pick up an attribute from a specific object, for example.

SERVLET

String op = request.getParameter("option");

if(op.equals("Car")){
    try{ 

        JSONArray jsonArray = new JSONArray();  
        JSONObject responseObj = new JSONObject();

        CarDAO d = new CarDAO();
        List<Car> procedimentos = d.listarCar();

        for(Car obj : procedimentos){

            JSONObject js = new JSONObject();
            double mst = obj.getValor();
            String data = obj.getData();
            String nome = obj.getNome();
            double avg = obj.getNome();

            if(nome.contains("KAL_69KV")){

                js.put("jsonKAL_69KV_percent",avg);
                js.put("jsonKAL_69KV", mst);
                js.put("json_KAL_69KV_Nome", ponto);
                js.put("json_KAL_69KV_Data", data);

            jsonArray.put(js);

            }else if(nome.contains("KCM_23KV")){
                String ponto = "KCM 23KV - CAMPO BOM 23KV";

                js.put("jsonKAL_69KV_percent",avg); 
                js.put("jsonKCM_23", mst);
                js.put("json_KCM_23_Nome",ponto);
                js.put("json_KCM_23_Data", data);
                jsonArray.put(js);
            }                    
        }               

        responseObj.put("jsonArray", jsonArray);
        out.print(responseObj);

    }catch (JSONException e){  
        e.printStackTrace();  
    }  
...
...

Ajax

$j.ajax({
    data: {
        'option': "Car"
    },
    dataType: 'json',
    url: './GetDados',
    type: 'POST',
    success: function(data) {

        queryObject = eval('(' + JSON.stringify(data) + ')');

        queryObjectLen = queryObject.jsonArray.length;

        for (var i = 0; i < queryObjectLen; i++) {

            //----------------------------------------------------
            get data from object 1.name
            get data from object 1.age
            get data from object 1.anotherValue
            //----------------------------------------------------

            //----------------------------------------------------
            get data from object 2.name
            get data from object 2.age
            get data from object 2.anotherValue
            //----------------------------------------------------

            //----------------------------------------------------
            get data from object 3.name
            get data from object 3.age
            get data from object 3.anotherValue
            //----------------------------------------------------
            .
            .
            .
        }

        if (queryObjectLen === 0) {
            alert("No data!");
        }

Answer 1

If queryObject is in JSON format, will have a structure {key:value}. Then just pick up with:

var value = queryObject['key'];

If not, you can user the JSON.parse first:

var parsed = JSON.parse(objectToParse);
alert(parsed['key'])

1. Make sure that you are sending a Servlet JSON as a response. Print it before sending and confirm.
2. Make sure you’re getting a JSON in AJAX or turn it into one. Print it when you receive and confirm.

Your for it is not necessary.