I don't understand what this is asking for:
"A 5-parameter constructor that accepts the book's title (a String), author (a String), publisher (a
String), copyright year (an int), and call number (a String), in this order. When a book is created, it will
not be checked out yet. Use the set properties for all relevant fields (except the checked out status
which does not have a property) to establish their initial values (instead of directly changing instance
variables). No other constructor exists for this class (there is NO parameterless constructor for this
class)."