[백준] 1427번 소트인사이드

포인트 : Stringbuffer 를 사용. 배열을 정렬한 다음 -> reverse() 함수를 이용하여 쉽게 풀었다..!

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String []num = br.readLine().split("");
		int [] arr = new int [num.length];
		for (int i = 0; i < arr.length; i++) {
			arr[i] = Integer.parseInt(num[i]);
		}
		Arrays.sort(arr);
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < arr.length; i++) {
			sb.append(arr[i]);
		}
		System.out.println(sb.reverse());
	}
}