android 读取json数据（遍历JSONObject和JSONArray）

public String getJson(){
        String jsonString = "{\"FLAG\":\"flag\",\"MESSAGE\":\"SUCCESS\",\"name\":[{\"name\":\"jack \"},{\"name\":\"lucy\"}]}";//json字符串
        try {
            JSONObject result = new JSONObject(jsonstring);//转换为JSONObject
            int num = result.length();
            JSONArray nameList = result.getJSONArray("name");//获取JSONArray
            int length = nameList.length();
            String aa = "";
            for(int i = 0; i < length; i++){//遍历JSONArray
                Log.d("debugTest",Integer.toString(i));
                JSONObject oj = nameList.getJSONObject(i);
                aa = aa + oj.getString("name")+"|";
                
            }
            Iterator<?> it = result.keys();
            String aa2 = "";
            String bb2 = null;
            while(it.hasNext()){//遍历JSONObject
                bb2 = (String) it.next().toString();
                aa2 = aa2 + result.getString(bb2);
                
            }
            return aa;
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }