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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.Liu Guiduo sat on the deck and looked frustrated.4. Referer Check冷静理智的法政部高级化验师高彦博（欧阳震华 饰），洞察力过人的他单凭一条头发、衣物纤维便能协助警方破案。但他没有想到的是，妻子的弟弟、身为法医的古泽琛（林文龙 饰）和高级督察梁小柔（蒙嘉慧 饰），都怀疑彦博毒害了自己的妻子。为韩国版【麻辣鲜师】，描写校园内的青春纪事。主角人物李世灿外表很帅，颇受女孩 子欢迎。但因为个性冷酷 ... 一集东光高校新学期开始，二年五班所有的学生全部聚集在一起，其中游多颖是从乡下学校转学过来的学生，活泼开朗的她开学第二天就被朴光道老师受到处罚，原因是穿著布鞋来学校，多颖认为这种校规不合理，并要求朴老师进一步说明原因，这句话害自己跪了一个上午。在一堂话 法课上，她发挥了犀利的口才……在清南村，平日里也只跟郑家和张家走得亲近些。