문자열 내림차순으로 배치하기(문제26)

public class Solution {
    public String solution(String s) {
        return s.chars()
                .boxed()
                .sorted((v1, v2) -> v2 - v1)
                .collect(StringBuilder::new,
                        StringBuilder::appendCodePoint,
                        StringBuilder::append)
                .toString();
    }
}

import java.util.stream.*;
import java.util.*;

class Solution {
    public String solution(String s) {
        char[] arr = s.toCharArray();
        Arrays.sort(arr); // 오름차순 정렬
        return new StringBuilder(new String(arr)).reverse().toString();
    }
}