[JAVA] 문자열 정리하기(2) toCharArray

영어 대소문자로 이루어진 문자열 my_string이 매개변수로 주어질 때, my_string을 모두 소문자로 바꾸고 알파벳 순서대로 정렬한 문자열을 return 하도록 solution 함수를 완성해보세요.

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풀이1 ) split()

import java.util.Arrays;
class Solution {
    public String solution(String my_string) {
        String answer = "";
        my_string = my_string.toLowerCase();
        String[] ch = my_string.split("");
        Arrays.sort(ch);
        for(int i=0;i<ch.length;i++){
            answer+=""+ch[i];
        }      
        return answer;
    }
}

풀이2) toCharArray()

import java.util.*;
class Solution {
    public String solution(String my_string) {
        char[] c = my_string.toLowerCase().toCharArray();
        Arrays.sort(c);
        return new String(c);
    }
}

 

 

toLowerCase

toUpperCase