조회한 빈이 모두 필요할 때, List, Map 강의 질문있습니다.

package hello.core.autowaried;

import hello.core.AutoAppconfig;
import hello.core.discount.DiscountPolicy;
import hello.core.member.Grade;
import hello.core.member.Member;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.List;
import java.util.Map;

public class AllBeanTest {
    @Test
    void findAllbean(){
        ApplicationContext ac= new AnnotationConfigApplicationContext(AutoAppconfig.class,DiscountService.class);

        DiscountService DiscountService=ac.getBean(DiscountService.class);
        Member member=new Member(1l,"userA", Grade.VIP);
        int dinscountPrice=DiscountService.discount(member,10000,"fixDiscountPlicy");
        Assertions.assertThat(DiscountService).isInstanceOf(DiscountService.class);
        Assertions.assertThat(dinscountPrice).isEqualTo(1000);
    }

    static class DiscountService{
        private final Map<String, DiscountPolicy> policyMap;



        private final List<DiscountPolicy> policies;

        @Autowired
        public DiscountService(Map<String, DiscountPolicy> policyMap, List<DiscountPolicy> policies) {
            this.policyMap = policyMap;
            this.policies = policies;
            System.out.println("policyMap = " + policyMap);
            System.out.println("policies = " + policies);

        }


        public int discount(Member member, int price, String discountCode) {
            DiscountPolicy discountPolicy=policyMap.get(discountCode);
            return discountPolicy.discount(member,price);
        }
    }
    }

해당강의에서 8분 52초를 따라하고 있는데 아래같은 에러가 나옵니다. 근데 강의 초반부에 나오는

policyMap,policies는 제대로 출력이 됬는데 어디가 잘못된걸까요?

2. 강의와 다르게 discountService를 DiscountService로 등록했는데 왜 에러 없이 잘 되나요?

   2.  

      DiscountService DiscountService  <=보통 DiscountService discountService 이렇게 선언되어야 하지 않나요?

   @Test
   void findAllbean(){
       ApplicationContext ac= new AnnotationConfigApplicationContext(AutoAppconfig.class,DiscountService.class);
   
       DiscountService DiscountService=ac.getBean(DiscountService.class);
       Member member=new Member(1l,"userA", Grade.VIP);
       int dinscountPrice=DiscountService.discount(member,10000,"fixDiscountPlicy");
       Assertions.assertThat(DiscountService).isInstanceOf(DiscountService.class);
       Assertions.assertThat(dinscountPrice).isEqualTo(1000);
   }