### Question:
BookServiceImpl implements BookService { @Override public void loanBook(String from, String to, String bname) { bookLibDao.update(bname, from, to); }  @Override void loanBook(String from, String to, String bname);  }### Answer:
@Test public void loanBook() { bookService.loanBook("张三", "wa", "java Book"); List<Book> query = bookLibDao.query(); System.out.println(query); }