[프로그래머스]오픈채팅방

https://programmers.co.kr/learn/courses/30/lessons/42888

코딩테스트 연습 - 오픈채팅방

 

 

java set

 

 

java array split

 

import java.util.HashSet;

public class kakao42888 {
    public static void main(String[] args) {
        String[] record = {"Enter uid1234 Muzi", "Enter uid4567 Prodo","Leave uid1234","Enter uid1234 Prodo","Change uid4567 Ryan"};
        String[] answer = SolutionKakao42888.solution(record);
    }
}


class SolutionKakao42888 {
    public static String[] solution(String[] record) {
        HashSet<String> set = new HashSet<String>(); // set 선언

        String[] answer = {};
        StringBuilder answer2 = new StringBuilder("Hello");
        return answer;
    }
}