(JAVA) 문자열 내림차순으로 배치하기

import java.util.Arrays;
import java.util.Collections;

class Solution {
  public String solution(String s) {
        String[] sArr = s.split("");
        Arrays.sort(sArr, Collections.reverseOrder());
        return String.join("", sArr);
    }
}

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public class ReverseStr {
    public String reverseStr(String s){
    char[] answer= s.toCharArray();
    Arrays.sort(answer);
    return new StringBuilder(new String(answer)).reverse().toString();
    }

출처: www.programmers.co.kr