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Next, I began to learn JDK & JAVA from October to improve my knowledge. Design Pattern is a summary of the experience of predecessors in code development and a series of routines to solve specific problems. It is not a syntax regulation, but a set of solutions to improve code reusability, maintainability, readability, robustness and security.该剧通过当今时代的母亲和女儿的关系，讲述韩国目前面临的低生育率、高离婚率、不婚等年轻世代的问题。当士兵肖恩埃默里（特纳）在阿富汗谋杀的罪名被推翻，因为有缺陷的视频证据，他作为一个自由人和他的小女儿返回生活。但当伦敦一个夜晚的闭路电视镜头曝光时，肖恩的生活发生了令人震惊的转折，他必须很快再次为自由而战。随着新晋升的迪雷切尔凯里（格雷格）起草调查肖恩的案件，她很快了解到，真相有时可能是一个角度的问题。她应该信任肖恩·埃默里吗？这次抓捕是一部由六部分组成的惊悚片，讲述了一个令人不安的假新闻世界和情报部门的非凡能力。在这个“后真理时代”，我们真的能相信我们所看到的吗？这部影片由英国电影自由贸易协会（bafta）获奖电影制作人本•查南（ben chanan）执导，全盛时期电视台（heyday television）和nbc环球影城（nbc universal international studios）为bbc制作。　　一次，他在虢国，那里正流行瘟疫，他冒着生命危险为老石公治愈了重病，并亲自到牛头山揭露了假借扁鹊名义跳神弄鬼愚弄百姓的巫祝，使百姓相信医学才能治病。扁鹊通过长期实践，总结出望、闻、问、切四诊法，为百姓治愈了许多疑难疾病。一边问白大哥其他问题。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu(Reference)