OOPs concept and implementation
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The document discusses object-oriented programming concepts and their implementation in creating a feedback form application. It introduces OOP concepts like inheritance, abstraction, encapsulation, and polymorphism. Inheritance allows classes to inherit and reuse attributes and behaviors from a parent class. Abstraction defines common properties of classes under a generalized superclass. Encapsulation hides internal details and data within classes. Polymorphism enables one interface to multiple forms of implementation through inheritance. The document provides examples of how these concepts can be applied to develop classes for different question types in a feedback form.
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OOPs concept and implementation
- 1. www.sblcorp.com OOPs Concept and Implementation Presented by, Sandeep Kumar SBL Controlled
- 2. www.sblcorp.com Agenda SBL Controlled • Understad OOP Concepts • OOP Implementation • Benefits of OOP 2 of 23
- 3. www.sblcorp.com Problem SBL Controlled 3 of 23 Create a feedback form application
- 4. www.sblcorp.com Problem Solving Analyse the problem • Feedback Form • Objective Question • Multi Select Question • Subjective Question SBL Controlled 4 of 23
- 5. www.sblcorp.com What is Object Oriented Programming SBL Controlled • 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. 5 of 23
- 6. www.sblcorp.com What are the OOPs concepts SBL Controlled • Inheritance • Abstraction • Encapsulation • Polymorphism 6 of 23
- 9. www.sblcorp.com Inheritance (Make reusable) SBL Controlled • 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 9 of 23
- 10. www.sblcorp.com SBL Controlled 10 of 23
- 11. www.sblcorp.com Problem Solving SBL Controlled ObjectiveQuestion questionText optionsList MultiSelectQuestion questionText optionsList SubjectiveQuestion questionText setAnswer() setAnswer() setAnswer() 11 of 23
- 13. www.sblcorp.com Abstraction (Make it as a type) SBL Controlled • 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(); 13 of 23
- 15. www.sblcorp.com Encapsulation (Capsulate things) SBL Controlled • 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? 15 of 23
- 16. www.sblcorp.com Encapsulation - Data hiding SBL Controlled 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) 16 of 23
- 17. www.sblcorp.com Polymorphism ( Many Forms) SBL Controlled • 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(); 17 of 23
- 19. www.sblcorp.com Polymorphism SBL Controlled Traverse through all questions 19 of 23
- 20. www.sblcorp.com If no Polymorphism SBL Controlled 20 of 23
- 21. www.sblcorp.com If no Polymorphism SBL Controlled Traverse through all questions 21 of 23
- 22. www.sblcorp.com Benefits of oops SBL Controlled • 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 22 of 23