How this implementation differenciate from "Wrapper" pattern from last lecture ?

Hey! You're right that the design patters are similar but there is a key difference that I think I understand. The difference as I see it that on the on hand a wrapper extends a 'parent' class and in doing so extends its functionality - by overriding some methods and adding new ones. Just think about all of the methods you can call on an Integer object - as opposed to an int. On the other hand, an adaptor implements an interface and, at the same time, has a private object as its only field. When overrides the interface's methods - it calls other methods on its private field to allow for a cross-functionality between the object field and it's implemented interface. This providing an interface between the two. That's how I see it anyway.