题解 | #图片整理#

import java.util.Scanner;

//排序， 冒泡或者快排(填坑法)
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String s = in.nextLine();
            char[] arr = s.toCharArray();
            int len = arr.length;
            for (int i = 0; i < len; i++) {
                for (int j = i + 1; j < len; j++) {
                    if (arr[i] >= arr[j]) {
                        char temp = arr[j];
                        arr[j] = arr[i];
                        arr[i] = temp;
                    }
                }
            }
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < len; i++) {
                sb.append(arr[i]);
            }

            System.out.println(sb.toString());
        }
    }
}