class Book
{
    private String author;
    private String title;
    public int pages;
    public String refNumber;
    int borrowed;
    boolean courseText;

    public Book (String bookAuthor, String bookTitle, int bookPages, boolean newCourseText)
    {
        author = bookAuthor;
        title = bookTitle;
        pages = bookPages;
        refNumber = "";
        courseText = newCourseText;
    }

    public String getAuthor ( ) {
        return author;
    }

    public String getTitle ( ) {
        return title;
    }

    public int getPages ( ) {
        return pages;
    }

    public String refNumber ( ) {
        return refNumber;
    }

    public void setRefNumber(String ref) {
        if (ref.length() >= 3)
        {
            refNumber = ref;
        }
        else
        {
            System.out.println("##################################################");
            System.out.println("Reference number cannot be less than 3 characters!");
            System.out.println("##################################################");
        }
    }

    public String getRefNumber ( ) {
        return refNumber;
    }

    public void increaseborrow() {
        borrowed = borrowed + 1;
    }

    public int getBorrowed() {
        return borrowed;
    }

    public boolean isCourseText() {
        return courseText;
    }

    public void printBook()
    {
        System.out.println("***********************************");
        System.out.println("Author: " + author + ".");
        System.out.println("Title: " + title + ".");
        System.out.println("Pages: " + pages + ".");
        if (refNumber.length() >= 3) {
        System.out.println("Ref No.: " + refNumber + ".");
    }   else {
        System.out.println("No reference number!");
    }
        if (borrowed == 0) {
        System.out.println(title + " hasn't been borrowed yet.");
    }
        else if (borrowed == 1)
        {
        System.out.println(title + " has been borrowed " + borrowed + " time.");
    }
        else {
        System.out.println(title + " has been borrowed " + borrowed + " times.");
    }
        System.out.println("Text book on a course: " + courseText + ".");
        System.out.println("***********************************");
    }
}