Java - Imprimir Funcion recursiva

public class Main {

    public static void reverse(String str) {

        if(1 == str.length()) {

            System.out.print(str);

        }else {

            reverse(str.substring(1));

            System.out.print(str.charAt(0));

        }

    }

    public static void main(String[] args) {

        reverse("123456");

    }

}