How to differentiate between interface and class from java Class

I have some legacy code that looks like:

    Set<Class<? extends Foo>> classes = reflections.getSubTypesOf(Foo.class);
    for (Class<? extends Foo> cl : classes) {
        Foo<?, ?> foo = cl.newInstance();
        // use foo
    }

I'd like to add another interface:

interface NewFoo extends Foo {...}

But then it tries to call newInstance on NewFoo. For now my solution is this:

        try {
            Foo<?, ?> foo = cl.newInstance();
            // use foo
        } catch (InstantiationException ignore) {
        }

but I wonder if there's a better way? Can I differentiate between an interface and a class when I have a Class object in my hand?