public class StringUtils {

/**

* If string is Palindrome the this function will return true else false

* @param input

* @return

*/

public static boolean isPalindrome(String input) {

if (input == null) {

throw new IllegalArgumentException("Input String must be not null");

}

char[] word = input.toCharArray();

boolean match = true;

int forward = 0;

int backward = word.length - 1;

while ((backward > forward) && match) {

if (word[forward] != word[backward]) {

match = false;

}

++forward;

--backward;

}

return match;

}

public static void main(String[] args) {

System.out.println( isPalindrome("12121"));

}

}