Class X - Class and Objects

The questions from this chapter are more or less predictable. No out of the box questions.
Object Oriented Programming :
It is a modular approach.It provides reusability of data.

Object

• Object is a unique entity whuch contains data and functions (i.e ) characteristica and behaviour.
• The characteristics in a real world object is considered as the data member in the software object.
• The behaviour in a real world object is considered as the method or function in sofware object.

Classes :

• Class is a set of similar objects.Each object has same attributes and behaviour.
• The charecteristics which make them different are the attributes.
• Therefore the data members contained within the class are called attributes.
• A class is the proottype of an object.Each object which belongs to a particular class has data and methods.As class produces objects of similar type, so class is called as an object factory.

Encapsulation :

• The system of wrapping data and function into a single unit is called as encapsulation.

Data abstraction :

• It is the act of representing essential features without including background details.

Inheritance :

• It is the process by which objects of one class can link and share some common properties of objects from another class.
• The advantage of this property is reusability.

Polymorphism :

• It is the process of using a function for more than one purpose.