Java - Abstract class

Abstract class:-

        A class can have a method(no body of the function), then that should be declared as abstract method and whose class should be declared as abstract class.

        An abstract class can have both abstract and non-abstract methods.

         Since abstract class can not be instantiated, it should have atleast one derived class.

        Abstract methods should be overridden by derived classes whereas non-abstract methods may or may not be overridden by derived classes.

        It is used to achieve dynamic polymorphism.

        Syntax

        ======

        accesspecifier abstract class classname

        {

        accessspcifier abstract rtype mname(arg,,,,);

        non abs method definition(instance & static)

        }