package nina;

public class poly
{
    public abstract class FirstLayer {
        protected int aVariable;
        protected abstract void bla();
        public FirstLayer(int foo)
        {
            this.aVariable = foo;
        }
    }
    public abstract class SecondLayer extends FirstLayer {
        public SecondLayer(int foo)
        {
            super(foo);
        }
    }
    public class ThirdLayer extends SecondLayer {
        protected int otherVariable;
        public ThirdLayer(int foo, int otherVariable)
        {
            super(foo);
            this.otherVariable = otherVariable;
        }
        @Override
        protected void bla()
        {
            System.out.println("Im doing something..");
        }
    }
}