json Bean对象转换

我在用gson做stringJSON 转换bean的时候，因为该bean内部嵌套对象，找了半天才找到他的用法，所有拿出共享一下

GsonBuilder builder = new GsonBuilder();
        //builder.excludeFieldsWithoutExposeAnnotation();
        Gson gson = builder.create();
       
        //嵌套bean 对象用法
        ApplyInfo user2 = gson.fromJson(json, new TypeToken<ApplyInfo>(){}.getType());
        
  return user2;

其中ApplyInfo:
 

public class ApplyInfo {

 private String cnName;
 private String compCode;
 private String enName;
 private String costCenter;
 private String travelType;
 private String reason;
 private String budget;
 
 private List<TravelInfo> travelInfo;
 private List<CarInfo> carInfo;
 private List<HotelInfo> hotelInfo;
 

否则 List 对象不能被转换