public class Main {
    public static class Parent {

    }

    public static interface GG {
        public void example();
    }

    public static class BallsOfSteel extends Parent implements GG {
        public void example() {
            System.out.println("I've got balls of steel");
        }
    }

    public static void main(String[] abc) {
        BallsOfSteel bos = new BallsOfSteel();
        bos.example();
    }
}