String stu = {
    "employees": [{"firstName": "Bill","lastName": "Gates"},
    {"firstName":"George","lastName":"Bush"},
    {"firstName": "Thomas","lastName": "Carter"}]}
JSONObject jsonObject = JSONObject.fromObject(stu);
Bean stu1 = (Bean) JSONObject.toBean(jsonObject, Bean.class);

JSONObject jsonObject2 = JSONObject.fromObject(stu1.getEmployees.get(0));
Bean1 stu2 = (Bean1) JSONObject.toBean(jsonObject2, Bean1.class);