Class And Objects

Yash Shah — Thu, 09 Jul 2020 18:12:24 +0000

A Class is a blueprint, template, or prototype that defines the variables and the methods common to all objects of the same kind.
Object acts as a member, specimen, or instance of the class.

Objects help programmers to use variables and methods as specified in the class.

Classes have logical existence and Objects have a physical existence.

Enough theory🥱, Let's take a real-world example of the laptop💻 on which you might be reading this tutorial:

Take a laptop class has:

variables(states): Brand, Operating System, Processor, and RAM
methods(behavior): start, restart and shutdown

Now, Let's real objects i.e real Laptops which follow the same blueprint as specified in the laptop class:

Object LAP-01:
Object LAP-02:

Taking look at these two objects: LAP-01 and LAP-02, You will observe that they have differences but they share the same prototype as specified in the parent class.

Thus, Class is a sketch while Object is the same sketch of a parent class with different colors.

What is OOP...?

Yash Shah — Sun, 05 Jul 2020 18:39:27 +0000

Starting with a basic question...

Why do we need programming..???
✔To design Software Applications that help in solving real-world problems.

One question More...🧐

How can we handle thousands/millions of lines of code of those complex software applications solving problems...?🙄

So, here comes the Object-Oriented Programming Paradigm...

The object-oriented model makes it easy to build up programs by accretion. What this often means, in practice, is that it provides a structured way to write spaghetti code.
--Paul Graham

Object-Oriented Programming(OOP) refers to the art of decomposing an application into a number of software objects that work together.

What are Software objects?
Take real-world objects to share two characteristics:
1.they all have state and,
2.they all have behavior.
For example, dogs have state (name, color, breed, hungry) and dogs have behavior (barking, fetching, and slobbering on your newly cleaned slacks).

Software objects are modeled after real-world objects in that they, too, have state and behavior. A software object maintains its state in variables and implements its behavior with methods.

In a Software Application,
Objects communicate with each other by sending
messages to each other.

For e.g., a Circle object
Data will be a center (x and y coordinates) and the radius.
This object will have methods to be able to set its center coordinates or its radius, and report its radius to other object.

Thus, Object-oriented programming (OOP) is a computer programming model that organizes software design around data, or objects. An object can be defined as a data field that has unique variables and methods.

DEV Community: Yash Shah

Class And Objects

What is OOP...?