题解 | #字符串加密#

class HelloWorld {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String key = in.nextLine();
        String m = in.nextLine();
        Set<Character> set = new TreeSet<>();
//   用set过滤重复 的  list作为索引表
        List<Character> list = new ArrayList<>(set);
        for (int i = 0; i < key.length(); i++) {
            if (set.add(key.charAt(i))) {
                list.add(key.charAt(i));
            }
        }
        for (int i = 0; i < 26; i++) {
            if (set.add((char) (i + 'a'))) {
                list.add((char) (i + 'a'));
            }
        }
        //System.out.println(list.toString());
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < m.length(); i++) {
            int index = m.charAt(i) - 'a';
            sb.append(list.get(index));
        }
        System.out.println(sb.toString());
    }
}