Java is Palindrome String code Example

public class IsPalindrome {
    // temporal: O(n) | spatial: O(1)
    private static boolean isPalindrome(final String s) {
        if (s == null) {
            return false;
        }

        final int half = s.length() >> 1;
        for (int i = 0; i < half; i++) {
            if (s.charAt(i) != s.charAt(s.length() - 1 - i)) {
                return false;
            }
        }
        return true;
    }

    private static void checkIsPalindrome(String s) {
        String ss = (s!=null) ? '"' + s + '"' : "null";
        System.out.println("isPalindrome(" + ss + "): " + isPalindrome(s));
    }

    public static void main(String[] args) {
        checkIsPalindrome(null);
        checkIsPalindrome("A");
        checkIsPalindrome("a");
        checkIsPalindrome("ala");
        checkIsPalindrome("Ala");
        checkIsPalindrome("elle");
        checkIsPalindrome("ellE");
        checkIsPalindrome("neuquen");
        checkIsPalindrome("neuQuen");
        checkIsPalindrome("Aa");
        checkIsPalindrome("aA");
    }
}

// Let me know if you have any suggestions, thanks in advance!