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Section = entry point + notification, the popular point is: when, where and what enhancement to do!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.上海解放在即，中共上海地下党接到情报，国民党保密局部署制定、代号为“墨斗鱼计划”的绝密档案，将于第二天下午五点押运台湾。情报显示，这份被国民党高层认为“共产党得到它，等于得到了大半座上海城”的档案，是八千多名特务在上海解放后的潜伏计划和详细名单……A complete computer system consists of hardware and software. As the name implies, hardware is the physical equipment that can be seen and touched in the computer, such as the host computer. Software, on the other hand, is relative to hardware. It refers to various programs and related documents needed to run on the computer, such as a drawing software or a gobang game. Computer hardware and software are indispensable. Hardware is the material basis on which software can work and is the "body". Software is the soul of the computer and the core of controlling and operating the computer. They complement each other and form a complete computer system. From the appearance, the computer includes: monitor, host computer, keyboard, mouse and sound box.Public void action () {吕馨眨了眨水灵灵的眼睛，看着陈启，娇滴滴的说道：天启大大，快点更新。“我想念每一个人。我们能在那个岛上再见面吗？”一条来自五年前自杀的学校明星“林珈安”的神秘信息被发送给了她以前的高中同学、学长和姐姐。每个人都想知道这个消息是如何发出的，因为林珈安很久以前就去世了。他们12个人回到了荒岛，也就是林珈安五年前去世的地方…向林珈安致敬，并找出是谁把这 个消息当成笑话的真相。但越接近真相，他们就越能发现自己残酷的过去。他们称之为“朋友”的人的黑暗秘密使这个荒岛变成了一个血腥的竞技场…