Welcome to the Ranch
When I used JCreator, I usually used it as an editor and executed the code from the command line. Isn't there a project→run option? If you do that, do you see a window similar to a command line? That is where the output should be.
To get a certain number of places after the decimal point, try the
% tags.
You have some peculiar design there. Why are you not setting those values
via a constructor? You don't usually call a getXXX method without assigning its value to something, as you are doing.