Java Text Output

So I'm working on a program right now and I'm saving the output to a text file from the command line like so:
java Program >> output.txt

However, this does not save error messages.
Is there a way to have it include error messages?

>>7
If you want to be pedantic, it's a question about whatever shell you're using. And I believe that that behavior is specified in POSIX, which would make it a *nix question. So yes, it is something that you should learn in a Linux class.