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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.这部真实的对话剧鲜明地刻画了每个人都会想到的、恋爱的人的丑陋。? After the 2008 financial crisis, the United States is facing great pressure from economic recession and rising unemployment, and urgently needs to change its development momentum. At the same time, the deindustrialization and emphasis on service industry in the past 20 years have led to a decline in the international competitiveness of the U.S. Economy, and it is urgent to upgrade the industrial system. Under this background, the then Obama administration put forward a re-industrialization strategy to optimize the domestic investment environment and attract the return of domestic manufacturing industry and foreign direct investment. In the current round of re-industrialization in the United States, the industrial Internet advocated by GE and other large multinational enterprises has become a typical representative.那一年，戚继光进京武举会试，此人拜学翰林院，恰逢此时，俺答率兵犯京师，两位本是学生身份，一文一武尚且年少的青年于危难之中，莫名其妙走到了一起，临危受命共同督防北京九门。CSI的故事背景设在赌城拉斯维加斯，以真人真事改编，讲述刑事警察局的法庭犯罪调查员如何在作案现场取得证据破案的故事。调查员的名言是“死尸会说话”，他们利用指纹、鞋印、子弹壳、血迹、毛发、纤维、尸体伤痕等微小证据，经过仔细的分析研究后，寻得破案的关键。 解开谜团的过程颇有吸引力。　　但凡看过《宰相刘罗锅Cat Rice Base Attack Bonus