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Possible Duplicate:
Abstract class in Java
I got several explanations but so far I’m not able to understand that what are the abstract classes and methods in Java.
Some said it has to do something with the security of the program, other said it isn’t anything like that.
Even from the Dietel & Dietel’s book I don’t get it’s purpose.
When,where and why do we use it?
Kindly explain it like you’re teaching a beginner, I would really appreciate your help.
An abstract class is a class that can’t be instantiated. It’s only purpose is for other classes to extend.
Abstract methods are methods in the abstract class (have to be declared abstract) which means the extending concrete class must override them as they have no body.
The main purpose of an abstract class is if you have common code to use in sub classes but the abstract class should not have instances of its own.
You can read more about it here: Abstract Methods and Classes