2325. 解密消息

2325. 解密消息

题解

模拟

public String decodeMessage(String key, String message) {
        // 存映射
        Map<Character, Character> map = new HashMap<>();
        int i = 0;
        for (char c : key.toCharArray()) {
            if (c == ' ') continue;
            Character character = map.get(c);
            if (Objects.isNull(character)) {
                map.put(c, (char) (i + 'a'));
                i++;
            }
        }
        StringBuilder sb = new StringBuilder();
        // 将加密字符映射成解密字符
        for (char c : message.toCharArray()) {
            if (c == ' ') sb.append(c);
            else sb.append(map.get(c));
        }
        return sb.toString();
    }