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13State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.此刻，正在看书的吕馨也不由屏住呼吸。臭名昭著的撰稿人莫名死亡，在调查事件真相的过程中，警方一步步走入了黑客一手制造的陷阱之中。This week, the consumer market will welcome Canada's GDP statistics for the fourth quarter, which is widely expected to be around 1.8%. The survey report is scheduled to be released on Monday (April 26), focusing on its negative impact on the future of Canada's economic development. The GDPNow Modeling of Chicago's Federal Government Inventory Financial Institution, a benchmark that closely tracks foreign GDP, has rebounded sharply in recent weeks, possibly suggesting that the initial foreign GDP statistics for the first quarter are not so bad. At the same time, Canada will also release the financial report of small and medium-sized enterprises and the durable goods survey report this week. Good friends who want to learn more about futures financing skills can pay attention to Xia Junshan (Baidu: XJS776) dynamic network supervision from 7 pm to 2 pm every day.