/*
  Lab exam 24/11/2004 (18:00)
  Solution Part 2
*/


public class UseBook {

  public static String expensiveBook(Book b1, Book b2) {
    if (b1.getCopies() == 0 && b2.getCopies() == 0)
      return null;
    else if (b1.getPrice() >= b2.getPrice())
      return b1.getTitle();
    else
      return b2.getTitle();
  }
}