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Some common behavior methods will be defined in the state class, and Context will eventually delegate the request to these methods of the state object. In this example, this method is buttonWasPressed. No matter how many state classes are added, they must implement the buttonWasPressed methodThe new unit certificate and legal person certificate must be handled at the same time, and both the certificate and the signature must be handled (for operation in the system, the electronic official seal and legal person seal must be affixed).The SYN flooding attack first appeared in 1996. At that time, Phrack magazine described this attack and implemented it in code [1]. This information was quickly applied to attack the mail and Telnet services of a network service provider (ISP) and caused downtime. CERT (Computer? Emergence? Response? Team) soon released a preliminary assessment and solution to this attack technology [2].2. 第二季会接着第一季的故事讲。"When the two mountains were fighting, I have fought many battles, However, the most impressive one was the battle to defend position 149 during the July 12 War. I thought that the war was between people and people. I didn't expect to fight with animals here, not only animals, but also flying in the sky and drilling in the soil. If it weren't for the use of new shells to support us later, the position would have been lost. "02　青　雲