Java String Reverse

Problem statement:
A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward.
Given a string , print Yes if it is a palindrome, print No otherwise
Constraints:
A will consist at most 50 lower case english letters.
Sample Input:
madam
Sample Output:
Yes

1. public class Palindrome {
2.     public static void main(String[] args) {
3.         String s = "madam";
4.         System.out.println(isPalindrome(s) ? "Yes" : "No");
5.     }
6.     public static boolean isPalindrome(String s) {
7.         int p = s.length() - 1;
8.         boolean flag = true;
9.         for (int i = 0; i < s.length() / 2; i++) {
10.             if (s.charAt(i) != s.charAt(p)) {
11.                 flag = false;
12.                 break;
13.             }
14.             p--;
15.         }
16.         return flag;
17.     }
18. }

Output:
Yes
Method-II:

1. public class Palindrome {
2.     public static void main(String[] args) {
3.         String s = "madam";
4.         isPalindrome(s);
5.     }
6.     public static void isPalindrome(String s) {
7.         String rev = "";
8.         for (int i = s.length() - 1; i >= 0; i--) {
9.             rev = rev + s.charAt(i);
10.         }
11.         if (s.equals(rev))
12.             System.out.println("Yes");
13.         elset a Palindrome");
14.     }
15. }

Output: 

Yes