/**
 * A class that maintains information on a book.
 * This might form part of a larger application such
 * as a library system, for instance.
 *
 * @author Rifqi Mukti Wicaksana
 * @version 29.09.2017
 */
class Book
{
    // The fields.
    private String author;
    private String title;
    private String refNumber;
    private int pages;

    /**
     * Set the author and title fields when this object
     * is constructed.
     */
    public Book(String bookAuthor, String bookTitle, String bookrefNumber, int bookPages)
    {
        author = bookAuthor;
        title = bookTitle;
        pages = bookPages;
        refNumber = "";
    }

    public String getAuthor()
    {
        return author;
    }

    public String getTitle()
    {
        return title;
    }
    public int getPages()
    {
        return pages;
    }
    public String getRefNumber()
    {
        return refNumber;
    }
    public void setRefNumber(String refNumber)
    {
        if(refNumber.length()<3) System.out.println("Reference Number has to be at least three characters!");
        else this.refNumber = refNumber;
    }
     public void printAuthor()
     {
         System.out.println(author);
    }
    public void printTitle()
    {
        System.out.println(title);
    }
    public void printDetails()
    {
        String refNumPrint = refNumber;
        System.out.println("Title: " + title + ",Author: " + author + ",Pages: " + pages);
        if(refNumPrint.length() < 0)
        {
            refNumPrint = "ZZZ";
        }
        System.out.println("Reference number: " + refNumPrint);
    }


}