Considering moving to .NET from java
.net, c#, java
Solution
It will certainly be a shift, largely in terms of learning the .NET framework when you're used to the Java APIs. A lot of the concepts are the same, but it's a case of learning where to find things. You shouldn't expect to effectively have 4 years of C#/.NET experience - but you'll have 4 years of general software development, which is certainly important in and of itself.
Moving from C# to Java isn't too bad, although generics are very different in C#. You'll find there are a lot of features in recent versions of C# which aren't in Java, and it's worth getting to know them to use the language to its best advantage.
Personally I find C# to be a much more elegant and powerful language than Java - and certainly one which has evolved a lot more rapidly. I use both on a regular basis, but my heart is with C#... and that's having come from a Java background like yourself. I certainly don't regret "moving" from Java to C#, particularly as it isn't so much a "move" as just adding an extra string to your bow. It's not like you're giving up your Java experience to learn .NET.
Having said all this, I don't think you need to worry about Java disappearing any time soon. I think it's reasonable to have concerns over the glacial rate of progress of the core API and language (although 3rd party libraries and indeed languages are moving rather faster) but I'm sure companies will be actively developing new products in Java for quite a few years to come.
Problem
I am a 4th year computer science student, at university alot of my projects were Java based so I am pretty used to the language, platform and apis. However for a long time, I have been reading alot regarding the .net platform improvements and it's large career opportunities (at least in my country). Now I am considering shifting to the microsoft world. I have several questions: Would it be severe to shift to .NET platform, as when I start my career I will be lacking the "4 years of java experiance" to a "1 year of c#/.net experience"? How harsh transaction from java world to .net world would be ? It feels like the future of Sun (and Java as a result) seems a bit blurry, can it be an issue on the long run ? EDIT: Sorry for the edit, I want to add that I am more into the telecommunication field (even tho I have no internship/job experience in this field yet). Plus indeed java is not my only language. I am really used to Python, LISP, Javascript,Php and some other markup languages. Thanks