URGENT - Empty method and abstract method.

[Anu]

What is the difference between abstract methos and a method without any body i.e. only empty braces are given for methos but no body is there.
Why cant we use empty method in the place of abstract method ?
Pls explain the usage/advantages/disadvantages of both....Its urgent !!!

[sandy gupta]

you do not have to provide the definition of a base class method but an abstract base class method needs to have a definition in the derived class
Got it

[Sunny Liu]

You can not call a abstract method, but you can call empty method. class with a abstract method, then it have to be a abstract class, sequencely you can instantiate a abstract class as well.
Usually you provide empty method just because you want to use some other methods from parent class or implements a interface but you do not want to implements all of methods defined in interface definition.