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This idea is exactly the same as what we often use. MyCollection defines some operations of the collection, MyIterator defines a series of iterative operations, and holds Collection instances. Let's look at the implementation code:If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.CAD shortcut key refers to the use of shortcut key instead of mouse in CAD software operation for the convenience of users. You can use keyboard shortcuts to issue commands to complete operations such as drawing, modifying and saving. These command keys are CAD shortcuts.Ma Jinyu: Firewood, our big firewood.However, there can only be one of these three drugs, and one of the ghost drugs and the explosive mushroom cannot be eaten if it is eaten first.本剧通过讲述我缉毒警察深入虎穴、将贩毒分子一网打尽的故事，展示了我国禁毒战场上波澜壮阔的场面，塑造了一批有血有肉的禁毒英雄形象，讴歌了我公安干警舍身忘我、无所畏惧的英雄气概，并昭示了“国家利益高于一切”的历史责任。本剧主题鲜明，不但涉及国家利益，也涉及伦理情感，在个人情感之上更昭显国家利益之重。本剧人物关系设置巧妙，情节跌宕起伏；同时感情充沛，感人至深。