Encapsulation - Definition - Objects Design

Q.  In OOD, the attributes(data variables) and methods( operation on the data) are bundled together is called _______ .
- Published on 22 Jul 15

a. Classes
b. Objects
c. Encapsulation
d. Inheritance

ANSWER: Encapsulation
 

    Discussion

  • Nirja Shah   -Posted on 16 Oct 15
    Object Oriented Design

    - This design works around the entities and their characteristics instead of functions involved in the software system.

    - This design strategies focuses on entities and its characteristics. The whole concept of software solution revolves around the engaged entities.

    - The important concepts of Object Oriented Design:

    Objects
    - All entities involved in the solution design are known as objects.
    - For example, person, banks, company and customers are treated as objects.
    - Every entity has some attributes associated to it and has some methods to perform on the attributes.

    Classes
    - A class is a generalized description of an object.
    - An object is an instance of a class.
    - Class defines all the attributes, which an object can have and methods, which defines the functionality of the object.
    - In the solution design, attributes are stored as variables and functionalities are defined by means of methods or procedures.

    Encapsulation
    - In OOD, the attributes (data variables) and methods (operation on the data) are bundled together is called encapsulation.
    - Encapsulation not only bundles important information of an object together, but also restricts access of the data and methods from the outside world.
    - This is called information hiding.

    Inheritance
    - OOD allows similar classes to stack up in hierarchical manner where the lower or sub-classes can import, implement and re-use allowed variables and methods from their immediate super classes.
    - This property of OOD is known as inheritance.
    - This makes it easier to define specific class and to create generalized classes from specific ones.

    Polymorphism
    - OOD languages provide a mechanism where methods performing similar tasks but vary in arguments, can be assigned same name.
    - This is called polymorphism, which allows a single interface performing tasks for different types.
    - Depending upon how the function is invoked, respective portion of the code gets executed.

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