我试图从json文件中获取数据，并将其保存为对象，然后放入不同的arrylist中，我陷入了无法将“a320”放入obejcts“type_ratings”：[“a320”]

List<Crew> Allcrews = new ArrayList<>();
List<Pilot> pilotsList = new ArrayList<>();
List<CabinCrew> Cabincrews = new ArrayList<>();`
public void loadCrewData(Path p) throws DataLoadingException{
    try {
        BufferedReader reader = Files.newBufferedReader(p);

        String jsonStr = "";
        String line = "";
        while ((line=reader.readLine()) !=null) 
        {
            jsonStr =jsonStr+line;
            }
        System.out.println ("Pilots Informations: ");
        JSONObject jsonObj = new JSONObject(jsonStr);
        JSONArray pilots = jsonObj.getJSONArray("pilots");
            for(int j =0; j<pilots.length(); j++) {
                JSONObject pilot = pilots.getJSONObject(j);
                Pilot pil = new Pilot();
                pil.setForename(pilot.getString("forename"));
                pil.setHomeBase(pilot.getString("home_airport"));
                pil.setSurname(pilot.getString("surname"));
                pil.setRank(Rank.CAPTAIN);
                pil.setRank(Rank.FIRST_OFFICER);
                pil.setQualifiedFor(pilot.getString("type_ratings"));;

                pilotsList.add(pil);
                Allcrews.add(pil);

                System.out.println( "Forename: " +pilot.getString("forename"));
                System.out.println( "Surname: " +pilot.getString("surname"));
                System.out.println( "Rank: " +pilot.getString("rank"));
                System.out.println("Home_Airport: " + pilot.getString("home_airport"));
                System.out.println("type_ratings: " + pilot.getJSONArray("type_ratings"));  
 catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}[![JSONFile][1]][1]