Algo.Java.StringTips

// convert chart to int

    private static int getNumericValue(String s) {
        StringBuilder sb = new StringBuilder();
        for (char c : s.toCharArray()) {
            sb.append(c - 'a');
        }
        return Integer.parseInt(sb.toString());
    }

       // convert char to int, one more example
        StringBuilder sb = new StringBuilder();
        for (char c : s.toCharArray()) {
            sb.append(c - 'a');
        }

        // if chars are only nums then we can count sum like this
        int sum = 0;
        for (int i = 0; i < sb.length(); i++) {
            sum += sb.charAt(i) - '0';
        }

isPalindrome

    private boolean isPalindrome(String s) {
        for (int i = 0; i < s.length() / 2; i++) {
            if (s.charAt(i) != s.charAt(s.length() - 1 - i)) {
                return false;
            }
        }
        return true;
    }