Class diagram operation

Question

Modeling class diagram requires set of classes associated with each others, each class has a set of attributes and operations.

My question is: how and where should i model implementations (bodies) for those operations?

Asking because i have confusion in understanding the application of concepts class, interface, abstract class

Answer 1

I agree that Interface and Abstract are set of "empty" (i.e. without code) Operation. It does not really exist a place for model implementation I mean each tool RSx, Rhapsody, Modelio, etc has its own strategy. It could be model as a UML Comment, an OpaqueBehavior, or an Activity owned by the Operation. UML does not define where and how the code (Operation bodies) should be.

I add a screenshot of Java code modelling using Modelio. As you see a specific UML Comment , named Code is created under the UML operation and the body of this comment are the code of the method