采用动态链表的方式管理电话本，功能类似手机上的电话本管理系统-Manage a dynamic list of the phone book, features similar to the phone book on the phone management system

IPHONE 手机图书管理系统，详细叙述了扩展类的使用，静态类合动态绑定。-IPHONE mobile library management system, described in detail the use of extended class, static class together dynamic binding.