First of all, don't name packages after locations on your computer. The recommended scheme is to use the components of your company's website hostname in reverse order, followed by a component identifying your application, and finally the names of subpackages:
If you don't have a website, pretend you do and make up a hostname.
Package names use dots to separate the components, not slashes.
Finally, your application can have multiple source folders, each acting as a root for your packages. For instance, if your application contains a folder for regular source files and one for test source files, its directory structure might look something like this:
You can compile the test files by specifying all the source folders with the -sourcepath switch: