Why should we use an abstract class? in what situation? is the same thing as interfaces? What are the advantages and disadvantages of using?
Also:: http://answall.com/q/3603/101, http://answall.com/q/73449/101, http://answall.com/q/89236/101, http://answall.com/q/89257/101, http://pt.stackoverflowcom/q/139045/101, http://answall.com/q/113065/101, http://answall.com/q/35317/101.
– Maniero