I want dicumntation for this class please:

public class Book

{

public String author;

public int numberOfPages;

public String title;

public int isbn;

public Book (String author,int numberOfPages,String title,int isbn) //this is constructor

{

this.author = author;

this.numberOfPages = numberOfPages;

this.title = title;

this.isbn = isbn;

}

public Book()

{

}

public void setAuthor(String author)

{

this.author = author;

}

public void setTitle(String title)

{

this.title = title;

}

public void setNumberOfPages(int numberOfPages)

{

this.numberOfPages = numberOfPages;

}

public void setIsbn(int isbn)

{

this.isbn = isbn;

}

public String getAuthor()

{

return author;

}

public String getTitle()

{

return title;

}

public int getNumberOfPages()

{

return numberOfPages;

}

public int getIsbn()

{

return isbn;

}

public void displayBook()

{

System.out.println("Book Author:"+author);

System.out.println("Book NumberOfPages:"+numberOfPages);

System.out.println("Book Title:"+title);

System.out.println("Book Isbn:"+isbn);

}

}