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java code problem

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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?
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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).
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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?

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