// Superclass
public class Hewan {
    public void suara() {
        System.out.println("Hewan mengeluarkan suara...");
    }
}

// Subclass Kucing
public class Kucing extends Hewan {
    @Override
    public void suara() {
        System.out.println("Meong!");
    }
}

// Subclass Anjing
public class Anjing extends Hewan {
    @Override
    public void suara() {
        System.out.println("Guk guk!");
    }
}