Java优学网@Autowired入门解析：掌握Spring依赖注入，轻松实现高效开发

@Autowired private UserService userService;

@Service public class OrderService {

private final PaymentService paymentService;
private final NotificationService notificationService;

// 连@Autowired都不用写了
public OrderService(PaymentService paymentService, 
                   NotificationService notificationService) {
    this.paymentService = paymentService;
    this.notificationService = notificationService;
}

}