In the "financial industry" there is a lot of Java, but in quant financ it's pretty rate. It's behind C++, C, C#, VBA, SQL, and Perl.
In the last month I have spoken to more working quants who use F# than Java.
If you already have Java skills, you are a useful part of the way to learning C++, since Java has a common ancestor in the same way that humans share an ancestor with chimps.
(Apologies to any creationists here).