$40\mathrm{.}1$ Create a Class

LAB ACTIVITY

$40\mathrm{.}1\mathrm{.}1$: Create a Class

$8/10$

For this lab, you will write a class that represents a book. The Book class will support the following hidden state:

title as a Java String

author$($s$)$ as an ArrayList of String

ISBN as a Java String

number of pages as an integer

retail price as a double

publisher as a Java String

Your Book class must support the following interface:

public Book$($String title, String isbn, int np$,$ double rp$,$ String publisher, String $...$ authors$)$

public String getTitle$()$

public String getIsbn$()$

public int getNumberOfPages$()$

public double getRetailPrice$()$

public String $[]$ getAuthors$()$

public String toString$()$

For example, the Java statement statements:

Book b $=$ new Book$("$Java How to Program",

$"978-0131016217",$

$1400,19\mathrm{.}97,$ "Prentice$-$Hall",

"Harvey M$.$ Deitel", "Paul J$.$ Deitel" $)$;

System.out.printf$("\%$s$\%$n$",$ b$)$;

should produce the following output:

That is$,$ the toString$()$ should produce a string that has the book object state in this order

title

authors $($comma separated with space after the comma inside $[]$

number of pages

retail price

publisher

ISBn

inside $<>.$

If the constructor receives a null value for any of the String state, that state should be set to "Unknown". If no authors are given, the ArrayList should contain a single string "Unknown".

For example, the Java statement:

Book b $=$ new Book$($null$,$ null, $5,20\mathrm{.}10,$ null$)$;

System.out.printf$("\%$s$\%$n$",$ b$)$;

should produce the output