String类型转JSONArray在转为List

String OPTIONS = pd.getString("OPSTIONS");
//转成JSONArray
JSONArray jsonArray = JSONArray.fromObject(OPTIONS);
//JSONArray转List，Topic.class是对象类的名称。
List<Topic> deptList = (List<Topic>)JSONArray.toCollection(jsonArray,Topic.class)

System.out.println(deptList.get(1).getId());
System.out.println(deptList.get(1).getContent());