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public class Library {
ArrayList<Book> books;
public Library(){
books = new ArrayList<Book>();
}
void add(Book book){
books.add(book);
}
boolean hasBook(Book book){
return books.contains(book);
}
public static void main(String[] args){
Library myBooks = new Library();
System.out.println(myBooks.books);
myBooks.add(new Book("Hvordan være tøff", "Anders"));
System.out.println(myBooks.books);
Book myFavorite = new Book("INF101", "Sondre");
System.out.println(myBooks.hasBook(myFavorite));
myBooks.add(myFavorite);
System.out.println(myBooks.hasBook(myFavorite));
System.out.println(myBooks.books);
Book wanted = new Book("Hvordan være tøff", "Anders");
System.out.println(myBooks.hasBook(wanted));
myBooks.add(new Book("Dyr", "Tommy"));
myBooks.add(new Book("Klima", "Susanne"));
myBooks.add(new Book("Biler", "Ida"));
myBooks.add(new Book("Andre ting", "Anders"));
Collections.sort(myBooks.books);
System.out.println(myBooks.books);
Collections.sort(myBooks.books, new CompareTitle());
System.out.println(myBooks.books);