User对象类
private Integer userId;
private String userName;
private String userPhone;
private Set books = new HashSet(0);
Book对象类
private Integer bookId;
private User user;
private String bookName;
private String bookPrice;
测试
User user;
UserDAO userdao = new UserDAO();
user = userdao.findById(3);
Set<Book> set = user.getBooks();
Iterator<Book> it = set.iterator();
for (Book book : set) {
System.out.println(book.getBookName());
}
上面是我写的代码,可以查询user对象总共有多少本book,怎么按顺序输出呢?