public class A {
       A(int i){}
       public static void foo(){}
       void bar(){foo();}
   }

class B {
       B(){}
       B(int i){}
       void dac(){A.foo();}
   }

class C extends B { 
       C(){}
} 

class D extends B { 
        D(int i){}
        void zer() { A.foo(); }
}