public class Test {
    class A {
        private void act(){};
    }
    
    class B extends A {
        protected void act(){};
    }
    
    class C extends B {
        public void act(){};
    }
    
    class D extends B {
        void act(){};
    }
    
    public static void main(String[] args){
        A obj = new Test().new D();
        obj.act();
    }
}