자바 코테 알고리즘 참고

List to Array
https://ifuwanna.tistory.com/355

Entry Set
https://gosasac.tistory.com/54

스트림
https://hbase.tistory.com/171

퀵정렬
https://st-lab.tistory.com/250

해시맵 정렬
https://codechacha.com/ko/java-sort-map/