Check if given string is palindrome

 Palindrome

A palindrome is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as madam or racecar.

class PalindromeString {

    static boolean isPalindrome(String str) {

        // 2 variable to traverse from left and right

        int i = 0;

        int j = str.length() - 1;

        while(i < j) {

            char c1 = str.charAt(i);

            char c2 = str.charAt(j);

            // If characters don't match but case may be ignored,

            // try converting both characters to uppercase.

            // Unfortunately, conversion to uppercase does not work properly

            // for the Georgian alphabet, which has strange rules about case

            // conversion.  So we can check lowercase as well

            // Above is JDK instruction

            char u1 = Character.toUpperCase(c1);

            char u2 = Character.toUpperCase(c2);

            if(u1 != u2 && Character.toLowerCase(u1) != Character.toLowerCase(u2)) {

                return false;

            }

            i++;

            j--;

        }

        return true;

    }

    

public static void main (String[] args) {

    String str = "Nadan";

        System.out.println(str + " is palindrome : " + isPalindrome(str));

  

        str = "Raghav";

        System.out.println(str + " is palindrome : " + isPalindrome(str));

}

}