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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:胡家三兄弟感觉一个巨人立在了他们面前，这次是精神上的。　　所以当日许鞍华找她演出桃姐一角时，她一看剧本便被感动起来，并说：“能和华仔再次合作真的太好，虽然是很久之前的事，也好像The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.人海茫茫的喧嚣闹市，业余骗子张明天撞见老年痴呆郭大海，一场看似毫无悬念的骗局，却被郭大海时不时清醒的病情所打乱……　　在这个成长的年纪，有每一位青年青春燃烧的热血故事，不虚伪，不掩饰，不服输，乐观向上，充满希望的闪耀青春！While (it.hasNext ()) {