Thanks!
I'm doing something wrong:
first I created a workspace for Eclipse D\alex
then I created a project MyProject there
As you said, when I created MyProject the D\alex\MyProject\src was created.
The class that I need to compile is in C\spv7.3\cb\pfv\spv\tests it is the package: package cb.pfv.spv.tests;
I copied the folders cb\pfv\spv\tests to D\alex\MyProject\src, so now I have
D\alex\MyProject\src\cb\pfv\spv\tests
Then I do File-Open File and open the file I need to compile from D\alex\MyProject\src\cb\pfv\spv\tests
then I try to compile it Project-Build Project but nothing happens.