Q$6($Sets and Maps$)$:

Consider the following Map in Java:

Map myMap $=$ new HashMap$()$;

$($ a $)$ Would your Book class need to implement the hashCode$()$ function for the above map? Why or why not?

$($ b $)$ You are given an array of Strings, as: String$[]$ myNames. This is to be treated as an array of keys into the map. Write a short piece of code, that for each of these keys in myNames, gets the corresponding book from the map, and prints the book.

$($ c $)$ Book is a user class. If you do: System.out.println$($bk$),$ where bk is an object of Book, what function does java call of the Book class to print bk$?$