https://www.techiedelight.com/ko/binary-search-stl-java-collections/ - 자바 Collection 이진검색
https://livenow14.tistory.com/31 - 자바 Framework에 관한 블로그
https://codevang.tistory.com/128 - 사용법
<aside> ✔️ Collection 표준화 Stream() 객체
</aside>
<aside> ✔️ Collection 자료구조들 및 표준화
</aside>
https://codechacha.com/ko/java8-method-reference/ (method reference)