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Wednesday, November 5, 2008

SAP Webdynpro ABAP Interview questions

1. What is the difference between narrowing cast and widening cast?
If we copy an instance of sub class to super class its called narrowing cast and the vise versa of it is widening cast.
2. Is model used in Webdynpro ABAP?
The webdynpro ABAP Graphical tool set doesn’t give any option to create model. We can define a class in transaction SE24 and the instance of that class can be used as model within the Wedbynpro code.
3. What are the different ways of getting data from a table and pass it to Webdynpro context node?
a. select the data to an internal table and pass it to the node using bind table method
b. use a model class instance to get data
c. use the service call option provided by webdynpro framework
4. What is the Service call option in Webdynpro ABAP?
Webdynpro ABAP Graphical toolset gives a wizard which automatically generates the code for calling a BAPI or Web service. This wizard will create a custom controller which has context nodes or attributes similar to the parameters of BAPI and a method which calls the bapi and pass the value to the context. We only need to use this custom controller within another controller, map the context and call the method.
5. What is an Application?
An application forms as the link between a component and URL.
6. What is a faceless component?
Faceless components are webdynpro components without window or view
7. In case of a component used within a component, how does parent component communicate to child component?
Parent component communicate with the child component through Interface controller and Interface view of the child component.
8. Interface View of a component has 1:1 relationship with ..?
The window of the component
9. What are actions in a view controller?
The methods that can be linked to the UI elements of a view are called actions.
10. What is role of plugs in views?
Plugs in views help the navigation between views. Navigation happens through the link created between outbound plug of a view to the inbound plug of next view.

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