Java 8 - Lambda: Ordenar lista de objetos

gistfile1.txt

class Book {
    String title;
    String author;
    Date date; 
}

Book book1 = new Book("Refactoring", "Martin Fowler", new Date());
Book book2 = new Book("Clean code", "Robert C. Martin", new Date());
Book book3 = new Book("Test Driven Development", "Kent Beck", new Date());

List<Book> books = Arrays.asList(book2, book1, book3);

books.stream()
  .sorted((bookObject1, bookObject2) -> 
    bookObject1.getHeader().getDate().compareTo(bookObject2.getHeader().getDate()))
  .collect(Collectors.toList());