class Book {

  private String author;
  private String title;

  public Book(String author, String title){
    this.author = author;
    this.title = title;
  }

  // getter, setter

  public String toString() {

      return "("+author + "," + title; + ")"
  }
}

class BookShelf implements Colneable{

  private ArrayList<Book> shelf;

  public BookShelf() {
    shelf = new ArrayList<Book>();
  }

  public void addBook(Book book) {

    shelf.add(book);
  }

  // getter, setter

  @Override
  protected Object clone() throws CloneNotSupportedException {
    // return super.clone();   // 얕은 복사
    BookShelf another = new BookShelf();    // 깊은 복사
    for(Book book : shelf){
      another.addBook(new Book(book.getAuthor(), book.getTitle())));
    }
    return antoher;
  }

  public String toString() {
    return shelf.toString();
  }
}

public class PrototypeTest {

    public static void main(String[] args) throws CloneNotSupportedException{

        BookShelf bookShelf = new BookShelf();

        bookShelf.addBook(new Book("태백산맥","조정래"));
        bookShelf.addBook(new Book("밥1","밥1"));
        bookShelf.addBook(new Book("bob1","bob1"));

        System.out.println(bookShelf);
        // [(조정래,태백산맥),(밥1,밥1),(bob1,bob1)]

        BookShelf another = (BookShelf)bookShelf.clone();

        System.out.println(another)
        // [(조정래,태백산맥),(밥1,밥1),(bob1,bob1)]

        bookShelf.getShelf().get(0).setAuthor("조정래");
        bookShelf.getShelf().get(0).setTitle("한강");

        System.out.println(bookShelf);
        System.out.println(another);
        // [(조정래,한강),(밥1,밥1),(bob1,bob1)]
        // [(조정래,한강),(밥1,밥1),(bob1,bob1)]
        // 얕은 복사가 됨


        // 깊은 복사 하면
        // [(조정래,한강),(밥1,밥1),(bob1,bob1)]
        // [(조정래,태백산맥),(밥1,밥1),(bob1,bob1)]


    }
}