public static void main(String[] args) {
        CTO cto = new CTO();
        System.out.println(cto);
    }

    public static interface Businessman {
        public void workHard();
    }
    public abstract static class Vagabond implements Businessman{
        @Override
        public void workHard() {

        }
    }

    public static class CTO extends Vagabond {

    }
}