How to convert list data into json in java

Question

I have a function which is returning Data as List in java class. Now as per my need, I have to convert it into Json Format.

Below is my fun

Answer 1

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

List ls =new  ArrayList();

for(product cj:cities.getList()) {
    ls.add(cj);
    JSONObject formDetailsJson = new JSONObject();
    formDetailsJson.put("id", cj.id);
    formDetailsJson.put("name", cj.name);
    jsonArray.put(formDetailsJson);
}

responseDetailsJson.put("Cities", jsonArray);

return responseDetailsJson;