Why can we change the unmodifiable list if we have the original one?

Question

By looking at the code of Collections class, i got to know that when we are using the method unmodifiableList(List list) or unmodifiableCollection(Coll

Answer 1

I believe the secret lies in implementation details... Collection.unmodifiableList() will simply give you decorated modifiable list. I mean unmodifiable list contains reference to modifiable list internally.