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structuring common method

 
Ranch Hand
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Hi All,

I have the following scenario:

There are classes "B","C","D" which are extending class "A". I do not have access to class "A" here. Now, I need to introduce a method "m" which can be commonly used by "B", "C" and "D". Can anyone suggest me some design pattern which can help me achieve this without having to duplicate the method across "B", "C " and "D" ?


Thanks,
Preethi
 
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Have a look at the Visitor pattern.
 
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Or create a class ExtendedA which implements that method and let B, C and D extend ExtendedA.
 
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Or create an interface with method m and let those three classes implement that interface. You'll need to use references of that interface type to call the method.
 
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