Making a Method common for different versions of same class

Question

I am generating Classes from XSD. For each revision in XSD, A new class is generated with same name but under a different package. If "Foo"is the class, the class name will be : model.v1.Foo , model.v2.Foo etc. fro each revision.

Irrespective of the version of class, some operations are common. Is there any way to create a common method, that can take up any version of Foo class

public static String doOperation(Foo foo){
    //Do some operation
}

The DoOperation method needs to be common for all the versions.

Answer 1

One possibility is create an interface like:

public interface FooIF {

    public default String doOperation(Foo foo){

        System.out.println("doOperation executed");

        return null;
    }
}

And have Foo implement it:

public class Foo implements FooIF{

    public Foo() {

    }

    public static void main( String[] args) {

        Foo f = new Foo();
        f.doOperation(null);
    }
}