arrays - iterate through JSONArray in java

I have a JSONArray :

public JSNArray getItems() {
  JSONArray listjson = new JSONArray();

  JSONObject fnl_json = new JSONObject(); 
  //adding few items to fnl_json 
  listjson.add(fnl_json); 
  return fnal_json; 
}

I am calling getItems function, how can I iterate through fnl_json from the called function?