Abstract class with all concrete methods

Question

Are there some practical programming situations for someone to declare a class abstract when all the methods in it are concrete?

Answer 1

When you have an important class but the system cannot create an instance fo this class, because

• this class is parent of a lot of classes of the system;
• this has a lot of responsability (methods used by a lot of class) for domain's requires;
• this class not represents a concrete object;