题解 | #图片整理#

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String orgStr = in.nextLine();
            if (orgStr.length() >= 1 && orgStr.length() <= 1000) {
                char[] chArr = orgStr.toCharArray();
                List<Character> strList = new ArrayList<>();
                for (int i = 0; i < orgStr.length(); i++) {
                    strList.add(orgStr.charAt(i));
                }
                Collections.sort(strList);
                strList.forEach((item)->{
                    System.out.print(item);
                });

            }
        }
    }
}