Is there any way of imitating OR in Java Generics

EDIT: I changed a bit the example for getting the idea:

Like

 <Integer or Float>

...without having to create a common interface and make a subclass for Integer and Float to implement it

If not, something like this would maybe have more sense and be useful

 <E extends Number> <E = (Integer|Float)>

If ? is a wildcard why should not we allowed to restrict certain types?