为什么@Qualifier 在@Service 中不起作用？

有一个接口

package ioc.primary_annotation;

public interface Animal {

    void display();

}

两个类实现它

package ioc.primary_annotation;

import org.springframework.stereotype.Component;

@Component("kitty")
public class Cat implements Animal {
    public void display() {
        System.out.println("Cat.display");
    }
}

和

package ioc.primary_annotation;

import org.springframework.stereotype.Component;

@Component("doggi")
public class Dog implements Animal {
    public void display() {
        System.out.println("Dog.display");
    }
}

有一个配置类

package ioc.primary_annotation;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackages = "ioc.primary_annotation")
public class AppConfig {
}

和服务

package ioc.primary_annotation;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;;
import org.springframework.stereotype.Service;

@Service
public class AnimalService {

    @Autowired
    @Qualifier("kitty")
    private Animal animal;

    public AnimalService() {
    }

    public Animal getAnimal() {
        return animal;
    }

    public void setAnimal(Animal animal) {
        this.animal = animal;
    }
}

所有这些都应该在 main 方法中起作用

package ioc.primary_annotation;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class PrimaryMain {

    public static void main(String[] args) {

        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
        Animal animal = applicationContext.getBean(Animal.class);
        animal.display();

    }

}

但它不起作用，抛出异常。

Exception in thread "main" org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'ioc.primary_annotation.Animal' available: expected single matching bean but found 2: kitty,doggi

问题是为什么它不起作用，因为我通过限定符指出了我应该使用哪个 bean？如果我在 Cat 或 Dog 类上方指定 @Primary 注释，那么一切都会神奇地开始工作，请告诉我这里有什么神奇之处，在此先感谢 :)