题解HJ36 | #字符串加密#

import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Scanner;
import java.util.Set;

// 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 key = in.nextLine();
        String s = in.nextLine();

        Set<Character> set = new LinkedHashSet<>();

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

        for (char i = 'a'; i <= 'z'; i++) {
            set.add(i);
        }

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

        for (Character character : set) {
            list.add(character);
        }

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

        for (int i = 0; i < s.length(); i++) {
            result.add(list.get(s.charAt(i) - 'a'));
        }

        for (Character character : result) {
            System.out.print(character);
        }
    }
}

有点麻烦但是 自己做出来了