Difference between Datahiding and Abstraction - OOPS

Hi,
I got stuck in finding the exact difference in these two.
1. Datahiding is achieved through the access specifiers or by using it inside the function or also by using it inside the class.
2. Abstraction means showing the necessary details and hiding the necessary details.
If the above definition for the abstraction is correct then datahiding and abstraction become similar, correct.?
Could u guys help me to clarify with example.
Thanks in advance.
NANDAKUMAR.T

Abstraction is like saying, "I don't care what it is, as long as it can be used the way I want, that's good enough for me."
A good example is the interface that you need to be able to drive a car, such as a manual transmission vs an automatic transmission. As long as the car has the expected interface (a steering wheel, gas / brake pedals, etc.) you should be able to drive
it. You can interface with a car in an abstract way. You shouldn't have to care about details of spark plugs just to drive the car. An "automatic transmission car" is an abstract class of car.
A concrete class of car would be a very specific make and model, that would come out of a factory according to some specifications.
You may ask a car rental agency for an "automatic transmission car", and then what you'll get is still some specific make and model of car, but you just don't care about what it is.
Data hiding just means that you don't get a description of the the details of all your data. If something's marked private, it means that the details of the definition need not go any further. In terms of a car, again, these are aspects of the
vehicle that don't go into the user manual. The parts are still there, but there's no obligation to provide a description of what the parts are. For example, there are many components in a car that are complex and sophisticated, but have simple
descriptions, are are replaced in their entirety then they fail, such as an "alternator". There's likely no public description of the contents of the alternator. "No user serviceable parts inside" is part of "data hiding".
You can achieve data hiding through abstraction. You can also achieve data hiding with access modifiers (public, private, protected, internal).
The differences in the terms you mentioned are should be taken quite literally. abstract, refers to the idea of a thing, without a concrete instance of the thing, and we use it to be able to substitute a one concrete thing for another, or
to design in anticipation of something that doesn't exist yet. And hiding data just means concealing data from view -- usually with hopes that people won't monkey around with things that are concealed.

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Regards
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Hi
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Difference Between BADI and User Exits
BADI's can be used any number of times, where as USER-EXITS can be used only one time.
Ex:- if your assigning a USER-EXIT to a project in (CMOD), then you can not assign the same to other project.
BADI's are oops based.
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As with customer exits two different views are available:
In the definition view, an application programmer predefines exit points in a source that allow specific industry sectors, partners, and customers to attach additional software to standard SAP source code without having to modify the original object.
In the implementation view, the users of Business Add-Ins can customize the logic they need or use a standard logic if one is available.
In contrast to customer exits, Business Add-Ins no longer assume a two-level infrastructure (SAP and customer solutions), but instead allow for a multi-level system landscape (SAP, partner, and customer solutions, as well as country versions, industry solutions, and the like). Definitions and implementations of Business Add-Ins can be created at each level within such a system infrastructure.
SAP guarantees the upward compatibility of all Business Add-In interfaces. Release upgrades do not affect enhancement calls from within the standard software nor do they affect the validity of call interfaces. You do not have to register Business Add-Ins in SSCR.
The Business Add-In enhancement technique differentiates between enhancements that can only be implemented once and enhancements that can be used actively by any number of customers at the same time. In addition, Business Add-Ins can be defined according to filter values. This allows you to control add-in implementation and make it dependent on specific criteria (on a specific Country value, for example).
All ABAP sources, screens, GUIs, and table interfaces created using this enhancement technique are defined in a manner that allows customers to include their own enhancements in the standard. A single Business Add-In contains all of the interfaces necessary to implement a specific task.
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hope this is helpful
Difference Between BADI and User Exits
Business Add-Ins are a new SAP enhancement technique based on ABAP Objects. They can be inserted into the SAP System to accommodate user requirements too specific to be included in the standard delivery. Since specific industries often require special functions, SAP allows you to predefine these points in your software.
As with customer exits two different views are available:
In the definition view, an application programmer predefines exit points in a source that allow specific industry sectors, partners, and customers to attach additional software to standard SAP source code without having to modify the original object.
In the implementation view, the users of Business Add-Ins can customize the logic they need or use a standard logic if one is available.
In contrast to customer exits, Business Add-Ins no longer assume a two-level infrastructure (SAP and customer solutions), but instead allow for a multi-level system landscape (SAP, partner, and customer solutions, as well as country versions, industry solutions, and the like). Definitions and implementations of Business Add-Ins can be created at each level within such a system infrastructure.
SAP guarantees the upward compatibility of all Business Add-In interfaces. Release upgrades do not affect enhancement calls from within the standard software nor do they affect the validity of call interfaces. You do not have to register Business Add-Ins in SSCR.
The Business Add-In enhancement technique differentiates between enhancements that can only be implemented once and enhancements that can be used actively by any number of customers at the same time. In addition, Business Add-Ins can be defined according to filter values. This allows you to control add-in implementation and make it dependent on specific criteria (on a specific Country value, for example).
All ABAP sources, screens, GUIs, and table interfaces created using this enhancement technique are defined in a manner that allows customers to include their own enhancements in the standard. A single Business Add-In contains all of the interfaces necessary to implement a specific task.
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What is difference between badi and user-exists?
What is difference between enhancements and user-exists? and what is the full form of BADI?
I have another doubt in BDC IN BDC WE HAVE MSEGCALL (i did not remember the > correct name) where the error logs are stored, MSEGCALL is a table or structure.
What is the system landscape?
1) Difference between BADI and USER-EXIT.
    i) BADI's can be used any number of times, where as USER-EXITS can be used only one time.
       Ex:- if your assigning a USER-EXIT to a project in (CMOD), then you can not assign the same to other project.
    ii) BADI's are oops based.
2) About 'BDCMSGCOLL' it is a structure. Used for finding error records.
3) Full form of BADI 'Business addins'.
3) System land scape will be depends on your project
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