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见项羽如此笃定，范增脸上不禁多了一层忧sè，这孩子总是这般不听坏…刘邦，总是难让人省心，对于这个威胁范亚父心中始终不曾放松警惕。毛小慧（郑裕玲）乃典型城中事业女性，美丽聪明，自视甚高，努力工作之余，感情上落得一片空白，每天暗地期盼真命天子的出现。一天旅行归来，公司起了翻天覆地的变化，老板竟安排了一个放浪不文、恶名远播的古惑师爷余乐天（黄子华）担任慧的助手，令慧苦不堪言，啼笑皆非。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.In popular terms, it is to use network node resources such as IDC server, personal PC, mobile phone, smart device, printer, camera, etc. to launch a large number of attack requests on the target, which leads to waste of network resources, congestion of link bandwidth, depletion of server resources and interruption of service, making it impossible to provide normal services to the outside world, and only game over can be announced. The detailed description is shown in the following figure:1941年，侵华日军向抗日根据地发起了疯狂的“扫荡”和“清乡”，同时，蒋介石制造了震惊中外的皖南事变，掀起了第二次“反共”高潮。中国人民的抗日战争进入了最困难的时期……Let's look at EventHandler's source code first.During the Western Han Dynasty, a shocking love story took place. Zhuo Wenjun, a good family born in a very rich family, fell in love with Sima Xiangru, a poor boy. In order to be with the person he loves, Zhuo Wenjun took the great risk of losing his reputation and resolutely chose to move away from home. After many hardships and frustrations, their marriage life turned for the better. However, at this time, Zhuo Wenjun's heart was pulled up by her husband's words, and their love will face another severe test. (Lecture Room 20160305 Poetry Love 2 Wish to Have One Heart)