Как можно внедрять зависимости в Spring

@Service
public class UserService {
    private final UserRepository repository;
    
    @Autowired // можно опустить начиная с Spring 4.3
    public UserService(UserRepository repository) {
        this.repository = repository;
    }
}

@Service
public class UserService {
    private UserRepository repository;
    
    @Autowired
    public void setRepository(UserRepository repository) {
        this.repository = repository;
    }
}

@Service
public class UserService {
    @Autowired
    private UserRepository repository;
}