题解 | #图片整理#

拆分成数组用sort就好

import java.util.*;

public class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);

        String[] str = sc.nextLine().split("");
        Arrays.sort(str);
        for (int i = 0; i < str.length; i++) {
            System.out.print(str[i]);
        }
    }
}