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In system development, some objects cannot be accessed directly due to network or other obstacles. At this time, a proxy object can be used to access the target object. Such as calling Web services in. NET.Time and Date Editor Property Settings那年轻军士看也没看军牌，对他笑道：是黎指挥回来了。? 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:Https://www.jiemian.com/article/2258238.htmlIn addition, I would like to say one more word about the skill of "craftsman". The so-called "increase the taste of chopping but not exceed the upper limit" means:温馨大家庭的影像记录故事已经来到了第五季。伴随着三个家庭点滴的成长与变化，相信这部剧集还将走得更远。