All a matter of opinion and experience.

I wouldn't want to do Java myself - I enjoy C# a lot thank you very much - but I know many Java developer who feel the same way about Java. The Java eco-system is a lot richer than .NETs although that is slowly changing with the open sourcing of everything Microsoft.

+++ Rick ---

>That's funny. Most people say C# reminds them of Java/ Java is the older of the two.
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>I have little experience with Java, but a friend of mine who has been a keynote speaker at both Java and .NET events and spent several years consulting with companies on interop between the two says he much prefers C#. It's easier and faster to get things done.
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>>What is your opinion about Java development? Let's say a complete business application, by creating a java base framework for the most important tools, similar as we used to do in VFP.
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>>I do not know much about Java, but at first sight it seems to provide sufficient functionality. it reminds me a lot about C#.