Exception 처리 및 메세지 처리 #1
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예외 처리는 커스텀 예외 클래스 만들어서 예외 복구로 처리했고,
상황 마다 다른 메세지로 출력하는 식으로 구현했습니다.
이제 메소드를 분리하고, 객체간 의존관계를 느슨하게 하는 식으로 객체지향적 코드 리팩토링이 필요합니다.