3:: Basics of Object orientation (Just brush-up)

1) Classes:

They are blue print to create objects

2)Object:

It is instance of class

3) Modules:

Set of classes grouped into  one is called module.

A fully qualified ,unique name=Module+name of the class

4) Inheritance:

Deriving properties from base classes. Emphasis on reusability

5)Interface:

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.

An interface is not a class. Writing an interface is similar to writing a class, but they are two different concepts. A class describes the attributes and behaviors of an object. An interface contains behaviors that a class implements

in summary,

Class has fields and methods. So it describes behavior of object.

Interface has abstract methods, they are implemented by classes. i.e class behavior is defined in interface.

6) Constructor:

Used to initialize the variables of the objects.

7) Destructor:

used to deallocate the variables.