Pergunta de entrevista da empresa Audible

Constructores, palabra final, static, que hace este codigo (int e Integer que imprime si no esta declarado), mas eficiente arraylist o linkedlist, etc etc Ejercicio The feature lists a set of audiobooks that you have not already purchased from the books that your friends have bought, in order of most bought to least bought.To help with this, you have the following two APIs. These have already been getPurchases(person): Returns a list of audiobooks owned by the pers getFriends(person): Returns a list of friends of the person. Complete the function that takes in a person and returns the audiobooks that person's friends are buying.