Methods Vs FM

Question

Hi Gurus,
Please clarify my query.
I have been using some of the methods in Objects (can also be done by using Functional Modules).
For an effective OO programming , the usage of functional modules are acceptable or not?
Thanks

Answer 1

Hello Raja,
Object oriented programming is mainly used when we need to cater to the requirement of simulating characteristics and behaviour of mulitple instants (or real life objects) of a specific type (class).
It is this advantage of multiple instantiation that leads us to use classes and objects. A class has atrributes and methods to describe characteristics and behaviour of real life entities respectively. Inside your method implementation if required you can use function modules, there is nothing wrong in that, but function modules should not be written as independent modularisation unit in a program written completely in object oriented manner.
1 more thing - function groups and function modules support encapsulation - a property of object oriented programming - global data of function group can be accessed only by function modules of that function group - but function groups and function modules do not support multiple instantiation unlike classes in object oriented programming. So if you need multiple instantiation you should use classes and methods instead of function groups and function modules.
Hope this clarifies.
Regards
Indrajit