Learn Abstract Class and Interface - Day 11

 In this article .we are learn Abstract Class and Interface.

Abstract Class:

• Abstract class is declared by using keyword abstract.
• Abstract classes are mainly for inheritance where other classes may derive from them.
• An abstract class can be derive by using ‘extends’ keyword. 
•  We cannot create an instance of an abstract class.
• Abstract class is a class that includes both abstract and regular methods.
• Methods within abstract class which are marked as abstract do not contain an implementation and must be implemented in derived classes. 
• So the  abstract class is used for inheritance where other classes are derived from abstract class.

• Syntax:-

abstract class ClassName{

//variables declaration;

//abstract or non-abstract methods;

}

Interface:

• It is like a blueprint of class, only method implementation is not possible in interface.
• It contains properties, methods & events.
• Users have to give method definitions in implemented class of interfaces.
• We can implement an interface by using the implements keyword in class.
• An interface is a contract which defines a function with respect to parameters or arguments and data types.
• Interface supports multiple inheritance.
• Interface can't contains the implementation of abstract class.

• Syntax:

interface InterfaceName{    

     // properties, methods & events

}   

Thank you....