abstraction2

//A simple abstruct class
abstract class A{
    abstract void callme();
    void callmetoo(){
        System.out.println("this is an concrete method.");
    }
}

class B extends A{
    void callme(){
        System.out.println("B's implementaton of callme .");
    }
}

class AbsractDemo{
        public static void main(String agrs[]){
            A b=new B();

            b.callme();
            b.callmetoo();
        }
}