Oop’s

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  • 1. OOPOOPObject Oriented ProgrammingObject Oriented ProgrammingBy : Tauseef Ahmad (107)
  • 2. Evolution of OOPEvolution of OOP1,0Machine LanguageAssembly LanguageProcedure-OrientedObject-Oriented Programming
  • 3. Procedure-OrientedProcedure-Oriented• The primary focus is on functions.• It basically consist of list of instructions for computerto follow, and to organize these instructions intogroups known as functions.
  • 4. Structure of POPStructure of POP[Procedure oriented programming][Procedure oriented programming]Main ProgramFunction-1 Function-2 Function-3Function-4 Function-5Function-6 Function-7 Function-8
  • 5. Drawbacks of POPDrawbacks of POP• Most of the function share global data.• It does not model real world problem very well.Global data Global dataFunction-1 Function-1 Function-1Local Data Local Data Local Data
  • 6. Object-Oriented LanguagesObject-Oriented Languages• Object-oriented programming is not the right of anyparticular language.• Like structured programming, OOP concept can beimplemented using any language like C andPascal.
  • 7. Object-Oriented ParadigmObject-Oriented Paradigm• Object-oriented programming (OOP) is aprogramming paradigm that uses "Objects" andtheir interactions to design applications andcomputer programs.• Everything around us are objects interacting witheach others.• Each object has a set of features, includingadjectives and verbs.• Object-oriented paradigms is sometimes thought tobe a simulation of the real-world around us, whichmake it the paradigm of choice for mostapplication domains: GUIs, games, business, etc.
  • 8. Basic concepts of OOPBasic concepts of OOP• Objects• Classes• Data Abstraction and Encapsulation• Inheritance• Polymorphism• Dynamic Binding• Message Passing
  • 9. ObjectsObjects• Objects are the run-time entities.• It may represent a person, a place, a bankaccount, a table of data or any item.• Objects take up space in the memory and have anassociated address like a structure in c.• Some examples : car, man, woman etc
  • 10. ClassesClasses• A class is an abstract definition of an object.• Defines how would the object look like whencreated.• Think of classes like the patents of actual inventions.
  • 11. EncapsulationEncapsulation• Wrapping up of data and functions into a single unitis known as Encapsulation.• Encapsulation is hiding the functional details fromthe object calling it.• Can you drive a car?o Yes, I can!• So, how does acceleration work?o Huh?• Details encapsulated (hidden) from the driver.
  • 12. Data AbstractionData Abstraction• Abstraction refers to the act of representingessential features without including the backgrounddetails or explanation.• An abstraction is a form of representation thatincludes only what is useful or interesting from aparticular viewpoint.• Example : A map is an abstract representation,since no map shows every detail of the territory itcovers
  • 13. InheritanceInheritance• Inheritance is the process by which objects of oneclass acquire the properties of objects of anotherclass.namephoneNumberaddresshourlyWageWageContract()CalculateTax()PayTuition()DropCourse()ProfessornamephoneNumberaddresssalaryTeachCourse()CalculateTax()DevelopCourse()OREmployeenamephoneNumberaddressCalculateTax()SupportStaff ProfessorTeachCourse()DevelopCourse()salarySubclassesWageContract()hourlyWageSupportStaff
  • 14. InheritanceInheritanceManSuzukiWomanBMWCar Human
  • 15. PolymorphismPolymorphismint add(int a, int b, int c){return (a+b+c); It will return addition} of 3 integer numbersint add(int a,int b){return (a+b); It will return addition} of 2 integer numbersfloat add(float a, float b, float c){return (a+b+c); It will return addition} of 3 float numbers
  • 16. PolymorphismPolymorphism• Polymorphism is a Greek term means the ability totake more than one form.ShapeDraw()Circle ObjectDraw (circle)Box ObjectDraw (box)Triangle ObjectDraw (triangle)
  • 17. Message PassingMessage Passing• The process by which an object:o Sends data to another object.o Asks the other object to invoke a method.• In other words, objects talk to each others viamessages.
  • 18. 18Object and Their InteractionObject and Their InteractionProgram
  • 19. 19Object and Their InteractionObject and Their InteractionProgramTom, hold your sweep!
  • 20. 20Object and Their InteractionObject and Their InteractionProgramTom, hold your sweep!Tom, beat jerry!
  • 21. 21Object and Their InteractionObject and Their InteractionProgramTom.holdYourSweep()Tom.BeatJerry()IN PROGRAMMING
  • 22. 22Object and Their InteractionObject and Their InteractionProgramTom.holdYourSweep()Tom.BeatJerry()IN PROGRAMMINGmessage
  • 23. 23Object and Their InteractionObject and Their InteractionProgramTom.holdYourSweep()Tom.BeatJerry()IN PROGRAMMINGmessagemessage