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官方剧照(9张)The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.However, this so-called Nearing Death Awareness is not a scientific term, but was put forward by Maggie Callanan and Patricia Kelley, two hospice nurses, in their best-selling book "The Last Gift".你呢，要是有心的话，该干什么就干什么。为了寻找失散了的muu开始了行动的hajimi，在那里完成奇迹的邂逅——。Strategy mode: Pay attention to the encapsulation algorithm, support the change of algorithm, and replace the algorithm independently of the customer at any time by encapsulating a series of algorithms.