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abstraction

s.palanivel rajan
Ranch Hand

Joined: Sep 22, 2009
Posts: 40
what is mean by ABSTRACTION ?Please explain be the basic concept of ABSTRACTION


With Regards,
S.Palanivel Rajan B.E.
Patricia Samuel
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Joined: Sep 12, 2007
Posts: 300
Abstraction is something like showing only the essential information to the user.
For example, abstracting a leather soccer ball to a ball retains only the information on general ball attributes and behaviour.
We are not telling here that ball is a soccer ball. We will just give essential attributes of a ball.


Regards,
Patricia
s.palanivel rajan
Ranch Hand

Joined: Sep 22, 2009
Posts: 40
I understand your definition.. But in polymorphism also we are using the same concept is it?
Patricia Samuel
Ranch Hand

Joined: Sep 12, 2007
Posts: 300
Please read the following -

http://dotnetslackers.com/articles/csharp/PolymorphismEncapsulation.aspx

It might clear your doubt about polymorphism. Polymorphism means to have different form of a thing. Like overloading is the example of Polymorphism.

Regards,
Patricia.
Stanley Walker
Ranch Hand

Joined: Sep 23, 2009
Posts: 87
this question is to the bartenders and the ranchhands.
would i be correct if i say that interface is a form of abstraction where the actual method implementations are hidden.simply the signature is displayed.
is dis correct?
Embla Tingeling
Ranch Hand

Joined: Oct 22, 2009
Posts: 237
Stanley Walker wrote:this question is to the bartenders and the ranchhands.
would i be correct if i say that interface is a form of abstraction where the actual method implementations are hidden.simply the signature is displayed.
is dis correct?


That's right.

In Java you create abstractions by defining your own types. In principle a type is the non-private interface of a class, and interface or an enum. You use the types to declare variables. Variables of a certain type can hold objects of a certain type. Because types are closely associated with variables and objects it's usually called data abstraction.

The type is what an object shows to the outside. This defines what you can do. Hidden inside is the implementation determining how it's done. This split is called encapsulation. When you encapsulate something you get an outside and an inside. The outside is the data abstraction (the type), the inside is information hiding (the implementation).
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 36453
    
  15
Stanley Walker wrote:this question is to the bartenders and the ranchhands. . . .
What makes you think you won't get a decent answer from a greenhorn?
Raghavan Muthu
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Joined: Apr 20, 2006
Posts: 3344

Campbell Ritchie wrote:
Stanley Walker wrote:this question is to the bartenders and the ranchhands. . . .
What makes you think you won't get a decent answer from a greenhorn?


Perhaps, the so called experience and the decent amount of earlier discussions they might have had so far. -- Just in my point of view. That's what I also used to think years before.


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Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 36453
    
  15
Copying thread to Ranch Office where discussion of "greenhorns" should continue.

Discussion of abstraction should continue here, please, and discussion about "greenhorns" in this thread.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 36453
    
  15
Stanley Walker wrote:. . . would i be correct if i say that interface is a form of abstraction where the actual method implementations are hidden.simply the signature is displayed.
is dis correct?
A lot of people would say that the Interface of a class consists of the signatures of the methods. This use of the word Interface is different from the specific meaning of the keyword interface in Java.
Embla Tingeling
Ranch Hand

Joined: Oct 22, 2009
Posts: 237
uj nossnahoj wrote:
Stanley Walker wrote:this question is to the bartenders and the ranchhands.
would i be correct if i say that interface is a form of abstraction where the actual method implementations are hidden.simply the signature is displayed.
is dis correct?


That's right.

In Java you create abstractions by defining your own types. In principle a type is the non-private interface of a class, an interface or an enum. You use the types to declare variables. Variables of a certain type can hold objects of a certain type. Because types are closely associated with variables and objects it's usually called data abstraction.

The type is what an object shows to the outside. This defines what you can do. Hidden inside is the implementation determining how it's done. This split is called encapsulation. When you encapsulate something you get an outside and an inside. The outside is the data abstraction (the type), the inside is information hiding (the implementation).
Stanley Walker
Ranch Hand

Joined: Sep 23, 2009
Posts: 87
my sincerest apologies to all the greenhorns...


i dont know why i said dat.....
but thanks for all your inputs
s.palanivel rajan
Ranch Hand

Joined: Sep 22, 2009
Posts: 40
Hey i am also a green horn i am new to this site and also i am new to java.. I don't have enough working experience in Java..May be in green horn side some of the members will be a entry level java programmers and some members will have lot of experience in java but new to this site..
But in bartenders side and ranch hand side it is not possible everybody will have lot of experience.. I think so that only he might be told like this..
So dont take it as series be positive and leave this matter here itself..
 
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