jde-complete-menu for JDK classes

I'm trying to use the jdee completion, i would like to display the java 
class names before instantiating an object.

For example:

- I would like to write "File" in the class. But, if i've Fi<cursor 
here> and i do jde-complete-menu, i've got "No completion at this 
point". Is it possible to jde, display all the classes, in this case, 
JDK classes, that starts with "Fi", or any other letter? How?

Thanks,
Pedro