An Abstract class serves as a template, so it must be 
extended /subclassed. It contains a static data. It means a 
class that is abstract may not be instantiated and its 
constructor can?t be called.  A class may be declared 
abstract even if it has no abstract methods that prevents 
it from being instantiated.

An abstract class is a class designed with implementation 
gaps for subclasses to fill in and is deliberately 
incomplete.

Hi...
Abstract class: U cannot instantiate an object of Abstract 
class.An abstract class should having atleast one abstract 
methoda and it should not final.

an abstract class is one which only gives the body of the 
class containing the methods with out any 
implementation.the abstract methods and the abstract 
objects cannot be instantiated

An abstrct class is a class which contains special property 
than ordinary class.
An abstarct class contains atleast one abstract method 
which will be left to its subclass to implement.
An abstract class defines some common properties to its 
subclass