Object Oriented Programming Concept: Abstract Method.

Question

Abstract method does not have implementation, we need to override it in child class for implementation. Then why we use abstract method, as we have to declare it again for implementation?

Nilesh Shah · Accepted Answer

Abstract methods are used to force the child class implement the method, the logic inside the method can be anything suitable as per child class.

While designing class libraries, or working in multi-team programming ofter it is required to leave what happens in a method to the actual implementor or coder, but you may need to specify at least that a method with this name and these arguements must be present.

Let's say you may be calling a method after some work is finished, now you will need to know the name and arguements of that method in your class library, but it is left to you as the user of that class library what you want to do when some work is finished. here it can be achieved by an abstract method.