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Question
what are the main underlying concepts of object orientation?
 Question Submitted By :: Guest
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what are the main underlying concepts of object orientation?
Answer
# 1
Mainly there are four concepts for OOAD.
1.Abstraction -grouping of data and behaviour(operations) 
into a conceptual object.
2.Encapsulation -Its the implementation mode of data 
abstraction.With encapsulation, we can accomplish data 
hiding
3.Polymorphism -Polymorphism refers to the process whereby 
an object invokes a method of another object in a common 
manner (with the same name) without understanding or caring 
how it is accomplished. 

4.Inheritance-When an object is derived from another 
object. It inherits all the properties etc
 
Is This Answer Correct ?    6 Yes 1 No
Shahir
 
  Re: what are the main underlying concepts of object orientation?
Answer
# 2
Abstraction - Interfaces are the best examples of 
abstraction .
Encapsulation - Classes are best examples of encapsulation.

Generally we encapsulate what varies & 
we abstract commonalities...

One more thing, You should always subclass for behabiours..
you should never subclass for properties / attributes. If 
only properties vary, then you have got to encapsulate them 
in somewhere else e.g. in a class or in some collection 
object like - Properties in Java / Map 

Hope this helps..
 
Is This Answer Correct ?    4 Yes 1 No
Prasi
 
 
 

 
 
 
Other OOAD Interview Questions
 
  Question Asked @ Answers
 
Comment: C++ "includes" behavior and java "imports"  1
Difference: Object Oriented Analysis (OOA) and Object Oriented Design (OOD)?  1
Differentiate between Aggregation and containment?  1
Is class an Object? Is object a class?  10
What are the Design Patterns you know. Protech1
what are the main underlying concepts of object orientation?  2
In winform my controls [taskbar and progressbar] become inactive when heavy processing is going in background, how to avoid this via multithreading Hexaware1
Can link and Association applied interchangeably?  2
Why should project managers complete hard problems first in an OOSAD project?  2
What is guard condition? Syntel3
Every object has : state, behavior and identity - explain Protech2
What is Object Constraint Language (OCL)? Protech1
what is meant by "method-wars"?  2
What do you meant by "SBI" of an object?  2
How to resolve many to many relationship? Protech3
What is association? Protech2
How to use CRC Cards for Class Design? Protech2
What are the four phases of the Unified Process ? Protech3
Can you think of some nice examples where *multiple* actors are associated with a use case ? Protech1
Difference: Object Oriented Analysis (OOA) and Object Oriented Design (OOD)? Protech4
 
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