json Bean對象轉換

我在用gson作stringJSON 轉換bean的時候，由於該bean內部嵌套對象，找了半天才找到他的用法，全部拿出共享一下

GsonBuilder builder = new GsonBuilder();
        //builder.excludeFieldsWithoutExposeAnnotation();
        Gson gson = builder.create();
       
        //嵌套bean 對象用法
        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;
 

不然 List 對象不能被轉換