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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.若谷发现自己深深的爱上了极富正义感的剑平，然而，若谷的母亲却早就在心里为女儿物色好了结婚对象，更糟的是，大大咧咧的剑平似乎对若谷的强烈感情一无所知。在闺蜜甘露（白百何 饰）的“出谋划策”之下，主动出击的若谷屡战屡败。随着时间的推移，若谷的善良渐渐打动了剑平，就在两人之间的关系越走越近之时，他们的感情却遭到了若谷母亲的强烈反对。开始自由作战，分散。Netfilter is a packet processing module inside the core layer of Linux operating system, which has the following functions:在广告公司工作的“我”，于某次文案创意时对一女孩一见钟情，两人陷入热烈的恋情，女孩因比“我”小20岁而娇嗔地称“我”为“爸爸”。《强者风范》以冷江解放为主要背景，讲述了共产党人团结有识之士，与国民党、特务、土匪等各方势力斗智斗勇的故事。愚人千虑必有一得