Java 和简单的 json

问：

我正在尝试从 json 用户名中获取这是 json

[{"user_id":"1","username":"THEUSERNAME","count300":"0","count100":"0","count50":"0","playcount":"0","ranked_score":"0","total_score":"0","pp_rank":"0","level":"0","pp_raw":"0","accuracy":"0","count_rank_ss":"0","count_rank_s":"0","count_rank_a":"0","country":"0","events":[]}]

我的代码是

URL url = new URL("url");
        URLConnection c = url.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(c.getInputStream()));
        StringBuilder b = new StringBuilder();
        String line;
        while ((line = in.readLine()) != null) b.append(line);
        String text = b.toString();
        JSONParser jsonParser = new JSONParser();
        JSONObject jsonObject = (JSONObject) jsonParser.parse(text);
        String username = (String) jsonObject.get("username");
        System.out.println(username);

还有我得到的错误

Exception in thread "main" java.lang.ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject
at eu.dpp.ircbot.Ircbot.main(Ircbot.java:80)