Is there any reason for an empty concrete method in an abstract class?

Question

I was recently looking through some open source code PicketLink code. If you take a look at this class, you\'ll see a number of concrete methods in an abstract class that d

Answer 1

While not the most common case, sometimes it is handy in the context of a template method. In this case there is a method that defines the flow, leaving the concrete implementation of some parts to its subclasses. In some cases a default concrete behavior is to do nothing, leaving the concrete method in the base class empty, but allowing customization in the subclass by overriding it.

HTH