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You can see that PizzaStore depends on a SImpleFactory, which depends on an abstract pizza. Under normal circumstances, to decouple, control inversion is required. The core idea of control inversion is that neither the upper structure nor the lower structure depends on implementation, but on abstraction.TCP? SYN? Cookies? The specification format of does not involve interoperability issues, because they are only processed locally, and the specifications and procedures for generation and verification will vary slightly from implementation to implementation.当冒顿单于的动员令下达之后，匈奴大军便直扑代郡与雁门……匈奴来势汹汹，直接发起进攻，代郡与雁门的守军根本不敌，立即败退……情况似乎完全在意料之中，越军根本没有防备，或者他们有心防备，但是没有多余的兵马，也来不及做好防备。我还以为你担心我是坏人，不敢回去了。The research on classification ability is more in kindergartens and more in primary schools. Research by cognitive psychologists has found that children under 0-1 years old basically have no classification ability, and they mainly rely on individual perception. The classification ability of children aged 1-3 has begun to sprout, but the concept of "category" has not yet formed. The classification of children aged 3-5 is basically still based on external perceptible dimensions such as shape and color. For example, children in small classes in kindergartens are asked to classify red plastic balls, red apples and bananas. They will divide the balls and apples together, either according to the shape (circle) or according to the color (red), but they will not put apple kernel bananas together according to the function (edible). What if you add another celery?No. 70 Mai DavikaAccording to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.