인프런 스프링 핵심 원리 기본편을 정리한 글입니다.  관심사의 분리public class OrderServiceImpl implements OrderService { private final MemberRepository memberRepository = new MemoryMemberRepository; private final DiscountPolicy discountPolicy = new FixDiscountPolicy(); //DIP 위반 private final DiscountPolicy discountPolicy = new RateDiscountPolicy(); //DIP 위반 @Override public Order createOrder(Long memberId, String item..