An abstract class can contain abstract methods, meaning that the methods are declared, but have no implementation (no body). By itself, an abstract class is incomplete and cannot be instantiated. If a class contains one or more abstract methods, then the class itself must be declared abstract.
A concrete class is one that provides complete implementation, and can be used to instantiate objects.
"We're kind of on the level of crossword puzzle writers... And no one ever goes to them and gives them an award." ~Joe Strummer sscce.org
people here are not teaching staffs... people here are to help you when u have doubts after reading books... instead please dont blaber or else atleast keep track of wat you have posted.
Regards,
vignesh
All that thinking. Doesn't it hurt? What do you think about this tiny ad?
a bit of art, as a gift, the permaculture playing cards