title: how can we implement methods in multiples classes if we add methods in interface
body: <p>In an interview interviewer asked this question. In an Interface1 there are 10 methods and implementing that Interface1 there are 1000 classes. Later in Interface1 I have added 11th method. How can you implement that 11th method in all classes. later he asked how can you implement in only few classes. Because of 1000 classes you cannot just go to each class and implement, its time taking. Can you tell me how to solve.</p>