Efficient way to check String palindrome or not in java

 public class CheckPalindromEfficientWay {

    public static boolean isPalindrom(String str){
        int n = str.length();
        for( int i = 0; i < n/2; i++ )
            if (str.charAt(i) != str.charAt(n-i-1)) return false;
        return true;
    }

    public static void main(String[] args) {
        System.out.println(isPalindrom("madam"));

    }
}