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A visionary king in Swedish history said that from the perspective of daily application, decimal is more convenient than decimal. Before his death, he had imagined that the decimal system would be replaced by the decimal system within his jurisdiction.} else {俗话说，只有千日做贼的，没有千日防贼的。　　她决心找到外太空生命迹象的努力，只得到少数人的理解，但绝大多数人都认为她的行为是疯狂的。她和她的同事们为了寻找外太空生命而努力工作。The essence of these 23 design patterns is the practical application of object-oriented design principles, and it is a full understanding of the encapsulation, inheritance and polymorphism of classes, as well as the association and combination of classes.Policy pattern refers to defining a series of algorithms and encapsulating them. However, policy pattern not only encapsulates algorithms, but also encapsulates a series of business rules. As long as these business rules have the same objectives, we can use policy pattern to encapsulate them.《一本好书第二季》是由腾讯视频与实力文化共同制作的场景式读书节目，由陈晓楠主持。