[JAVA/프로그래머스] 연습문제: 문자열 내림차순으로 배치하기

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import java.util.*;
/**
 *
 * @author HEESOO
 *
 */
class Solution {
  public String solution(String s) {
      String answer = "";
      char[] array=s.toCharArray();
      Character[] arr=new Character[array.length];
      for(int i=0;i<array.length;i++){
          arr[i]=(Character)array[i];
      }
      Arrays.sort(arr, new Comparator<Character>(){
          @Override
          public int compare(Character c1, Character c2){
              return c2-c1;
          }
      });
      for(Character ch:arr){
          answer+=ch;
      }
      return answer;
  }
}