题解 | #字符串排序#

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

public class HJ26 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()){
            String str = in.nextLine();
            List<Character> list = new ArrayList<>();
            char[] chars = str.toCharArray();
            for (int i =0;i<str.length();i++) {
                if (Character.isLetter(chars[i])) {
                    list.add(chars[i]);
                }
            }
            list.sort(new Comparator<Character>() {
                @Override
                public int compare(Character o1, Character o2) {
                    return Character.toLowerCase(o1) - Character.toLowerCase(o2);
                }
            });
            StringBuffer sb = new StringBuffer();
            for (int i=0,j=0; i<str.length();i++){
                if (Character.isLetter(str.charAt(i))) {
                    sb.append(list.get(j++));
                }else {
                    sb.append(str.charAt(i));
                }
            }

            System.out.println(sb);


        }
    }
}