oops concept and implementation

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OOPs Concept and Implementation

Presented by, Sandeep Kumar

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Agenda

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• Understad OOP Concepts

• OOP Implementation

• Benefits of OOP

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Problem

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Create a feedback form application

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Problem SolvingAnalyse the problem

• Feedback Form

• Objective Question

• Multi Select Question

• Subjective Question


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What is Object Oriented Programming

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• Programming concepts purely based on Objects.

• Objects are like real world objects

• Object has its own properties(data) and behaviors(functions) like any real world objects

• Class - Description of object

• OOPs concepts are invented to make programming and problem solving easy by relating problem to real world scenarios.

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What are the OOPs concepts

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• Inheritance

• Abstraction

• Encapsulation

• Polymorphism

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Problem Solving

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ObjectiveQuestion

questionText

optionsList

MultiSelectQuestion

questionText

optionsList

SubjectiveQuestion

questionText

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Inheritace

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ObjectiveQuestion

optionsList

MultiSelectQuestion

optionsList

SubjectiveQuestion

Question

questionText

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Inheritance (Make reusable)

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• Creating a new class from existing class is called inheritance.

• Existing class is parent class

• New class is child class

• And the new class has the inheritable property of its parent class and its own properties

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Problem Solving

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ObjectiveQuestion

questionText

optionsList

MultiSelectQuestion

questionText

optionsList

SubjectiveQuestion

questionText

setAnswer() setAnswer() setAnswer()

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Abstraction


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Abstraction (Make it as a type)

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• Class is the description of Object

• Abstract class is the description of a class

• Question is abstraction of ObjectiveQuestion, MultiselectQuestion, SubjectiveQuestion

• abstract - existing in thought or as an idea but not having a physical or concrete existence

• Abstract class is used to inherit and create new child derived, like in real world object car is not exist, but car companies use basic car concept to create their own cars by adding their own idea.

• Similarly we cannot create Question question = new Question();

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Encapsulation


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Encapsulation (Capsulate things)

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• Modulizing things

• Capsulate data and function into a single entity

• Ability to hide certain parts of themselves from programmers

• Data hiding is done with access modifier private protected and public keywords.

• private - only accecible to class

• protected - accesible to class, child class, same package

• public - No acces restrictions

• From whom we hide data?

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Encapsulation - Data hiding

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System Library

BatteryManager

chargePercentage

protected setCharge()public getCharge()

• setCharge() is a protected method, so only system can acces that method

• System reads charge value from battery hardware and update to chargePercentage using setCharge()

• Library, SDK ( Software Development Kit)

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Polymorphism ( Many Forms)

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• Polymorphism - One thing has several different forms

• Many forms of representation of an object

• We can represent ObjectiveQuestion in many forms like

• ObjectiveQuestion is a ObjectiveQuestion

• ObjectiveQuestion objectiveQuestion = new ObjectiveQuestion();

• ObjectiveQuestion is a Question

• Question question = new ObjectiveQuestion();

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Polymorphism


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Polymorphism

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Traverse through all questions

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If no Polymorphism


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If no Polymorphism

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Traverse through all questions

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Benefits of oops

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• Code Reuse and Recycling: Objects created for Object Oriented Programs can easily be reused in other programs.

• Encapsulation: Once an Object is created, knowledge of its implementation is not necessary for its use. In older programs, coders needed understand the details of a piece of code before using it (in this or another program).

• Software Maintenance : An Object Oriented Program is much easier to modify and maintain than a non-Object Oriented Program. So although a lot of work is spent before the program is written, less work is needed to maintain it over time

• Improve code quality: Each class is written in each file. Which makes for better designs with less flaws. That improves code readability

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Thank You
