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We know that for the above code, Xiao Hong subscribes to shoeObj, an object that buys shoes, but if we need to subscribe to buying houses or other objects in the future, we need to copy the above code and change the object code inside again. For this reason, we need to encapsulate the code.(From left to right: Jolin Tsai, Wu Jianhao, Zhou Yumin, Jay Chou, Guo Fucheng, Zheng Xiuwen, Yan Chengxu, Zhu Xiaotian, Edison Chen)Synflood attack is the most common DDoS attack on the current network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing.DNS Query Flood张大栓郁闷地嘀咕道：想养狗，求我这个活祖宗不就成了。叶卡捷琳娜正在进行激烈的权力斗争，宣布战争，镇压叛乱……在她的肩上-一个沉重的负担的权力。俄罗斯的命运掌握在她的手中。1. Creator: FactoryPizzaStore as defined above. It is an abstract class, which defines the method of creating objects. This method is an abstract method, and the specific process of creating objects is implemented by its subclasses. This abstract class usually relies on an abstract Product (another role in the factory method pattern) class. These abstract products are made by subclasses, and the creators do not care what kind of products are made.