java程序中json取值问题

public static void main(String[] args) {
        String jsonStr = "{‘head‘:{‘version‘:‘1‘},‘dataList‘:{‘resCode‘:‘ss‘,‘list‘:[{‘name‘:‘file1‘,‘type‘:‘0‘},{‘name‘:‘file2‘,‘type‘:‘1‘}]}}";
        JSONObject  dataJson=JSONObject.fromObject(jsonStr);
                JSONObject  dataList=dataJson.getJSONObject("dataList");
                JSONArray list=dataList.getJSONArray("list");
                JSONObject info=list.getJSONObject(1);
                String name=info.getString("name");
                String type=info.getString("type");
                 System.out.println(name+type);        //String name = jsonObject.getString("name");        //System.out.println(name);
    }