为什么在这种情况下我不能使用@Autowired？@SpringBootApplicationpublicclassApplication{@AutowiredBookingServicebookingService;publicstaticvoidmain(String[]args){bookingService.book("Alice","Bob","Carol");}}但可以使用@Bean@SpringBootApplicationpublicclassApplication{@BeanBookingServicebookingService(){returnnewBooking

为什么在这种情况下我不能使用@Autowired？@SpringBootApplicationpublicclassApplication{@AutowiredBookingServicebookingService;publicstaticvoidmain(String[]args){bookingService.book("Alice","Bob","Carol");}}但可以使用@Bean@SpringBootApplicationpublicclassApplication{@BeanBookingServicebookingService(){returnnewBooking