reverse string

public static String reverseString(String s) {
if(s == null || s.length() == 0) return s;
int n = s.length() - 1;
char[] array = s.toCharArray();
for(int i = 0; i < n / 2; i++) {
array[i] ^= array[n - i];
array[n - i] ^= array[i];
array[i] ^= array[n - i];
}
return new String(array);
}

public static String reverseStringRecursive(String s) {
if(s == null || s.length() == 0) return s;
return s.charAt(s.length() - 1) + reverseStringRecursive(s.substring(0, s.length() - 1));
}