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? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:陈启也看到了爱丽丝。However, once again, when iptables rules are not saved, please do not empty the rules in the chain or table unless you understand what you are doing.这是一间营业时间从午夜十二点到早上七点的特殊食堂。这里的老板，不太爱说话，却总叫人吃得热泪盈眶。在这里，自卑的舞蹈演员偶遇隐退多年舞界前辈，前辈不惜讲述自己不堪回首的经历不断鼓舞年轻人，最终令其重拾自信；轻言绝交的闺蜜因为吃到共同喜爱的美食，回忆起从前的友谊，重归于好；乐观的绝症患者遇到同命相连的女孩，两人相爱并相互给予力量，陪伴彼此完美地走过了最后一程；一味追求事业成功的白领，在这里结交了真正暖心的朋友，发现真情比成功更有意义。食物、故事、真情，汇聚了整部剧的主题，教会人们坦然面对得失，对生活充满期许和热情。每一个故事背后都饱含深情，情节跌宕起伏，令人流连忘返。本片根据日本同名日剧翻拍而成。According to the basic structure of the code above, TeaAndMilkGirl is a sent object (here is milk tea sister); Ceo is the object of giving gifts. He has preserved the attribute of milk tea sister and has his own privileged method. SendMarriageRing is such a method of giving gifts to milk tea sister. Then he wants to finish the matter through his agent, so he needs to create an agent model of economic man, named ProxyObj;. The main thing he does is, Give the gift given to him by the ceo to the ceo's lover, Therefore, the object also needs to save the ceo lover's object as its own attribute, and also needs a privileged method sendGift, which is to give gifts. Therefore, the ontology object can be instantiated in this method. The ontology object here is the ceo sending flowers. Therefore, it is necessary to instantiate the ontology object and call the ontology object's method (sendMarriageRing).我就是觉得，有些对不起板栗。Some timing operations on data no longer rely on external programs, but directly use the functions provided by the database itself.