Method generateChildren

java/0752-open-the-lock.java:36–46

(String lock)

    }

    private List<String> generateChildren(String lock) {
        List<String> children = new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            char[] digits = lock.toCharArray();
            digits[i] = (char)(((digits[i] - '0' + 1) % 10) + '0');
            children.add(new String(digits));
            digits[i] = (char)(((digits[i] - '0' - 2 + 10) % 10) + '0');
            children.add(new String(digits));
        }
        return children;
    }
}