This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
Mahendran A, please check your private messages. You can see them by clicking My Private Messages.
To answer your question: No, you cannot instantiate an abstract class. An abstract class is a class that is not yet "finished" - it contains methods without an implementation. A non-abstract subclass is supposed to implement those methods.