Abstract Class - Blue print of class

Interfaces - Only implemented members such as property index methods events

Abstract classes can not be instantiated it can have or cannot have abstract method basically known as mustinherit as the methods are static in nature

where interfaces are the declaration and r defined where they are called used for dynamic methods

Hai

Abstract class: It can't be instantiated.Some methods may abstract. It can't be implemented. It bis the blueprint of the class.

Interface: It can be instantiated.All the methods should be abstract. it can be implemented

Abstract class is a class which can only be inherited by a subclass whereas in an interface only some signatures will be provided. In case of interface the class that will implement this must write code against each methods / functions. Interface can inherit other interface only where an abstract class can inherit other classes . When my base class will be used by more than one group of user and they all might not use all the methods that my class will provide in that case we should go for an abstract class rather than an interface.

Public MustInherit class A

Interface A

1.We can't create instances for both

2.Single inheritance in abstract class multible inheritance in interface

3.We can have concrete method in abstact class but not in the interface.

4.Any class that needs to use abstract must extent

5.Any class that needs to use interface must implement

5.Interface all the variables are static and final.

abstract classes can have some methods dclared only not defined these methods are later definedin classes that will inherit abstract class

interface will have no method defined methods are only declared they are defined in class which implements interface

interface is implemented

abstract class is inherited