How can i test multiple java files with the same junit?

How can i test several .java files(that implements the same method in different ways) with one unit test? For example, i have a folder with different .java files(or different folders with the same name .java file), how can i select all of them to run it? right now i need to select each time one of them and move it to the same folder with the unit test and run it. Thanks.