<aside> 👉🏻 Reference
https://www.aladin.co.kr/shop/wproduct.aspx?ItemId=290892473
https://www.aladin.co.kr/shop/wproduct.aspx?ItemId=316593468
https://refactoring.guru/ko/design-patterns/catalog
https://www.youtube.com/playlist?list=PLpO7kx5DnyIFMZnGJyez_kpM8Bvy6Y1_w
OODP Example Codes & Materials
https://inpa.tistory.com/category/디자인 패턴
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