String reverse

public class Main {

    public static void main(String[] args) {
        System.out.println(reverse("abcdefghijklmnopqrstuvxyz"));
    }

    // Write a method to reverse a string.
    public static String reverse(String str) {
        StringBuilder s = new StringBuilder();
        for (int i = str.length() - 1; i >= 0; i--) {
            s.append(str.charAt(i));
        }
        return s.toString();
    }

}