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OOP

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This slideshow is the basics of Object Oriented Programming Concepts made for freshers.

This slideshow is the basics of Object Oriented Programming Concepts made for freshers.

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    OOP OOP Presentation Transcript

    • OOP Concepts Created by - Om Vikram Thapa
    • OOP vs. POP
        • Emphasis is on data.
        • Divides code into logical chunks individuals of a team can be experts in, and outsiders can understand via interfaces
        • Supports code evolution: internals can always be re-written as long as interface stays the same.
        • Data security.
      • Emphasis is on procedures.
      • This programming technique can only be used in a very small program.
      • if the same statement sequence is needed at different locations, the sequence must be copied. If an error needed to be modified, every copy needs to be modified.
    • Procedure Program view Main Program Data Procedure 1 Procedure 2 Procedure 3
    • OOP Program view Data Object 3 Data 3 + Procedures 3 Object 2 Data 2 + Procedures 2 Object 4 Data 4 + Procedures 4 Object 1 Data 1 +Procedures 1
    • Main OOP Concepts:
      • Object
      • Class
      • Abstraction
      • Encapsulation
      • Inheritance
      • Polymorphism
    • Objects and Class
      • An object represents something with which we can interact in a program
      • A class represents a concept, and an object represents the embodiment of a class
        • A class is a blueprint for an object.
      • A class can be used to create multiple objects
      • A program models a world of interacting objects.
      • Objects create other objects and “send messages” to each other.
      • Each object belongs to a class; a class defines properties of its objects. The data type of an object is its class.
    • Abstraction
      • One of the chief advantages of object-oriented programming is the idea that programmers can essentially focus on the “big picture” and ignore specific details regarding the inner-workings of an object. This concept is called abstraction .
    • Encapsulation
      • Abstraction in OOP is closely related to a concept called encapsulation .
      • Data and the ways to get at that data are wrapped in a single package, a class. The only way to access such data is through that package. This idea translates to information hiding.
    • Inheritance
      • Another of the main tenets of OOP is inheritance . Inheritance allows programmers to create new classes from existing ones.
      • A child class inherits its properties and attributes from its parents, which programmers can change.
    • Polymorphism
      • Polymorphism describes how programmers write methods to do some general purpose function.
      • Different objects might perform polymorphic methods differently.
      • The ability of objects to respond differently to the same message or function call.
    • Examples
      • Object legislates how its data may be accessed ( encapsulation )
        • Once you have created an ADT for complex numbers, say Complex, you can use it in the same way like well-known data types such as integers.
        • Encapsulation provides a way to protect data from accidental corruption.
      • One class may be a special case of another ( inheritance )
        • Rectangle is like a square, plus a second (possibly) distinct value
        • Colored-Rectangle is like a rectangle, plus the concept of color
      • Different classes in a hierarchy behave correctly( polymorphism )
        • shape.getArea(a,b) = len*wid, if shape is a rectangle
        • shape.getArea(a) = PI*r2, if shape is a circle