Program to check if entered string is Palindrome

public class Palindrome {
    public static void main(String args[]) {
        String input = "Madam";
        int number = 12321;
        System.out.printf("Is %s a palindrome? : %b %n", input, isPalindrome(input));
        System.out.printf("Is %s a palindrome? : %b %n", number, isPalindrome(number));
    }

    public static boolean isPalindrome(String input) {
        if (input == null || input.isEmpty()) {
            return true;
        }
        char[] array = input.toCharArray();
        StringBuilder sb = new StringBuilder(input.length());
        for (int i = input.length() - 1; i >= 0; i--) {
            sb.append(array[i]);
        }
        String reverseOfString = sb.toString();
        return input.equals(reverseOfString);
    }


    /*
     * Java method to check if a number is palindrome or not
     */
    public static boolean isPalindrome(int number) {
        int palindrome = number; // copied number into variable
        int reverse = 0;

        while (palindrome != 0) {
            int remainder = palindrome % 10;
            reverse = reverse * 10 + remainder;
            palindrome = palindrome / 10;
        }

        // if original and reverse of number is equal means
        // number is palindrome in Java
        if (number == reverse) {
            return true;
        }
        return false;
    }

/**
 * * Java method to check if given String is Palindrome
 * * @param text * @return true if text is palindrome, otherwise false
 */
public static boolean isPalindromString(String text) {
    String reverse = reverse(text);
    if (text.equals(reverse)) {
        return true;
    }
    return false;
}

/**
 * Java method to reverse String using recursion * @param input * @return reversed String of input
 */
public static String reverse(String input) {
    if (input == null || input.isEmpty()) {
        return input;
    }
    return input.charAt(input.length() - 1) + reverse(input.substring(0, input.length() - 1));
}
}