@Autowired

궁금한게 그전에 핵심원리강의에서는

@Component
public class MemberServiceImpl implements MemberService {
    private final MemberRepository memberRepository;
    @Autowired
    public MemberServiceImpl(MemberRepository memberRepository) {
        this.memberRepository = memberRepository;
    }
}

이런식으로 @Autowired로 주입을 받았는데 여기서는 왜 안쓴건가요?