Consequences of using an adapter pattern

I have read in lecture notes that consequences of using adapter pattern are:

1. for class case:

   • cannot adapt class with its subclasses
   • can overload adaptee object methods
2. for object case:
   • can adapt class with its subclasses
   • cannot overload adaptee object methods
   • gives possibility to add new functionality

So what means that you can or cannor overload adaptee methods? Is it correct? Or maybe it should be that you can overload a target methods?