Can you have multiple packages in one source code file, or do you have to have multiple files?

OK so I have to use separate files, I’ve been trying to do this but it has not been working.I’ve been following the instructions on the web site below.Basically what I’ve been doing is :package samples { public class SampleCode { public function SampleCode() { } }}Located in one file and in a second file:package { import samples.SampleCode; public class ExampleClass { public function ExampleClass(){ } }}But it just gives me error messages saying that it can’t find the imported class from the second file.http://www.adobe.com/devnet/actionscript/learning/as3-fundamentals/packages.html