java code problem

[peterx peter]

hi!
1-I try to put 5 diffent books in my library object but toString() method dose not work if I write like this: bok[].gettitle() but what do I put in the bok array (bok[?]).
2- How do I test the program?

class Book{
privateString title;
privateString author;
private String isbn;
public Book(String title, String author, String isbn)
{
this.title=title;
this.author=author;
this.isbn=isbn;
}
public String gettitle()
{
return title;
}
public String getauthor()
{
return author;
}
public String getIsbn()
{
return isbn;
}
}
//------------------
class Library{
private Book[] bok;
private int numberOfBook;
public Library(int size)
{
bok = new Book[size];
numberOfBook=0;
}
public void addBook(Book b)
{
if ( numberOfBook < bok.length)
{
bok[numberOfBook] = b;
numberOfBook += 1;
} else {
System.out.println("Catalogue is already full. "
+ "Unable to add new book.");
}
}
public int size()
{
return numberOfBook;
}
public String toString()
{
return "numberOfBooks: "+numberOfBook+" title: "+bok.gettitle()+"author: "
+bok.getauthor()+"isbn: "+bok.getIsbn();
}
}
public static void main(String[]atgs)
{
Library bibliotek = new Library(5); // Max 100 b�cker kan lagras
library.addBook(new Bok("book1", "Tom", "5452222"));
library.addBook(new Bok("book2", "De", "02220142"));
library.addBook(new Bok("book3", "Gr", "922227175"));
library.addBook(new Bok("book4", "En", "22223463"));
library.addBook(new Bok("book5", "Enl", "222963"));

[Ta Ri Ki Sun]

1. Your toString method should loop through all the books it has to get the information about book[0] through to the end.

2. What would you like to test? Your code has problems such as that Book[] never being initialised but essentially that main method at the end is creating a library and adding 5 books, to test further you can add the method getBook(int index OR String isbn etc).

[John Bartlett]

Problem you got is that you need to loop through your array of books.

Also why are you using arrays for such a thing as this, wouldnt it be better to have a dynamic list like an ArrayList? This would mean you would not have to specifiy a size you could jsut add as many books as you like.

O btw dont really think this is an Intermediate question?

John