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Correct way to simulate isbn number in j2ee application

I am trying to use a web application using servlets and jsps and I need to simulate the isbn number of an element in my class, as well as in sleeping mappings. What should be the isbn number type? Long or String? I came across many textbooks that use any of them. isbn is supposedly a 10-digit identifier. Sometimes you come across numbers like 0-85131-041-9, which cannot be long. Some examples use hyphen-free numbers.

So what type should be? Any suggestions?

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4 answers

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class ISBN {
  private String isbn;
  public ISBN(String isbn) throws ISBNFormatException {
    // you might want to filter hyphens first, before the check
    if(ISBN.isValid(isbn)) this.isbn = isbn;
    else throw new ISBNFormatException(isbn);
  }
  public static boolean isValid(String s) {
   // validate number here, see wiki
  }
}

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