Hi,
Visual JForex uses the same API methods as Java programming using Duksacopy API so the user will get familiar with these methods and the general development structure. This can help in switching to developing strategies in Java in JForex but as I'm not Java programmer so this is my personal point of view.
So it helps on understanding trading methods using JForex API : Yes
It helps starting Java programming from scratch : I would say No

Other users may have different opinions ...