题解HJ26 | #字符串排序#合并字符串那里有点东西

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

// 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()) {
            char[] charArray = in.nextLine().toCharArray();
            List<Character> list = new ArrayList<>();

            for (char c : charArray) {
                if(Character.isLetter(c))
                list.add(c);
            }

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

            StringBuilder result = new StringBuilder();
            for (int i = 0, j = 0; i < charArray.length; i++) {
                if (Character.isLetter(charArray[i])) {
                    result.append(list.get(j++));
                } else {
                    result.append(charArray[i]);
                }
            }

            System.out.println(result);
        }
    }
}