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difference between abstraction and encapsulation with progarammatic eg.
hi,just recently i went for an interview .The interviewer asked what is the difference between abstraction and encapsulation with programmatic eg.
I gave the answer as
encapsulation mean hiding the relevant data which is not useful for the user, eg a electric fan .hiding the information how the electricity is converted into machanical energy.
abtraction showing only the relevant data to the user eg electric fan.
it look ,its color ,it design etc only relevant data.
Then the interviewer asked me, give me some programmic eg .I Said
Let assume a web form having control like textbox,button etc.
The user can view textbox,button etc this is the eg of abstraction
and when the user click on the button how he is redirected is not known by the user is the eg of the encapsulation.
Am I Correct .was the answer given by me is perfect .now i am planing to go for an another interview should i give the same answer.IF not please suggest me a better answer.with some good eg Please help
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Answer Posted / sachinmundhra
Your approach is correct. Encapsulation is data hiding and
abstraction is a mechanism acheived by encapsulation.
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Question In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Question Submitted By :: Sunil Kumar I also faced this Question!! Rank Answer Posted By Re: In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Answer # 1 use copy constructors 0 Shanthila There is something to be taken care in destructor, in copy constructor, suppose the memory is assigned to the embedded member object pointer with the parameter passed value, but if some other objects of different class also are pointing to this memory, then if some one deletes the object then this class member pointer object will become dangling, or if the object is not deleted properly then there will be memory leak. Please suggest the design change required to handle or avoid this situation
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