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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.Then we must have written the following code before:Purple is the famous city line and Nagoya's ring road. Many important scenic spots and transfer stations are on the famous city line, which can be compared with Beijing's Line 2.除此之外，还有稳定和平衡的关系。美沙（高梨臨）在一家手遊公司上班，工作能力強、擁有出眾的外表，以社長位置為奮鬥目標，雖然是負責戀愛遊戲，但是自己的戀愛都無法持續兩個月以上，成為名符其實的敗犬女。很有機會升上主任的美沙在某天在公園遇上了理想戀人佳介（田中圭），以為愛情事業兩得意時，接到人事命令只升到副主任，而升上主任的竟是從紐約回國的營運專家佳介，頓時讓美沙受到多重打擊…Note: If there is no saved rule, please be careful when deleting the rule