题解HJ34 | #图片整理#

import java.util.ArrayList;
import java.util.Comparator;
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);

        String s = in.nextLine();

        List<Character> list = new ArrayList<>();

        for (int i = 0; i < s.length(); i++) {
            list.add(s.charAt(i));
        }

        list.sort(new Comparator<Character>() {
            @Override
            public int compare(Character o1, Character o2) {
                return o1 - o2;
            }
        });

        list.stream().forEach(x -> System.out.print(x));
    }
}