In business object what is the use of Interface

hi ppl,
In each business object there is a interface what can we do with that. When i used wizards like dynamic parallel processing it asked for wizards what is the actual use of interfaces.

Hi Dheepak,
I have an overview on interfaces. Someone pls correct me if i am wrong here.
Interfaces are generally used to group a set of attributes and methods that can be used across different business objects. You can create your own interfaces in SWO1 and when you include these interfaces in business objects you get all these attributes and methods in the business objects (Inheritance). Its basically for re-usability of the code(Reusability). Apart from that if required you can implement your own code for the methods thus maintaining the same name with a different logic for your BO (Polymorphism).
For example assume that you have a "Display" method and a few attributes in an interface. The "Display" method is used to display a particular transaction. Now you can include this interface in any BO and all these attributes and methods will be available in that BO with their respective implementation code. Now if you want the method to form a different action in any particular BO you can go ahead and redefine this code in that BO. This redefinition will not affect other BO's that had implemeted this same interface. All other BOs which had implemented this interface will continue to function as per the implementation code defined in the interface. This makes sure that the same method works in different ways in different BO's (Polymorphism)
Supertype<-->Subtype delegation will allow us to inherit the supertype/subtype methods/attributes but it does not allow us to change the underlying code in individual BOs. Hence polymorphism cant be acheived here
Thanks,
Prasath N
BO - Business Object

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