This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
i know the characteristic of abstract class and abstract method but i dont know what's the use of abtract method ? abstract class is totally fine that we use them for polymorphic purpose but, dont know abt abstarct method ?
An abstract method is used when you want to force a child class to implement a method, and/or there's no sensible default implementation for a polymorphic method. In the classic "Shape" example, whre you have a "Shape" class and subclasses like "Circle" and "Square", you'd make "draw()" an abstract method, since there's no sensible default way to draw a Shape without knowing what kind of shape it is.