hi dinesh,
Web Dynpro is the SAP programming model used to develop professional Web UIs for business applications. It consists of a runtime environment and a graphical development environment with special Web-Dynpro tools that are integrated in the SAP NetWeaver Developer Studio.
The Web Dynpro tools support application development during the implementation and design phases. When a Web Dynpro application is developed, a platform-independent metamodel is created from which Java classed are generated.
Since Web Dynpro features a clear separation between layout data and business data, you can develop Web Dynpro applications with the same programming model both for mobile devices and conventional PCs.
Web Dynpro offers application developers the following advantages:
· Different implementation languages are supported
· The use of declarative and graphical tools significantly reduces the implementation effort
· Web Dynpro supports a structured design process
· Strict separation of layout data and business data through use of the Model View Controller concept
· Reuse and better maintainability by using components
· The layout and navigation is easily changed using the Web Dynpro tools
· Stateful applications are supported – that is, if the page is changed, the data that are required again remain intact, so you can access the data from a previous page again
· Automatic data transport using data binding
· Automatic input check
· Automatic operation of the Web Dynpro application using the keyboard
· Flicker-free screen construction
· Syntax check at design time
Refer these links
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/web dynpro tutorial and sample applications.faq
regarding Java related webdynpro
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