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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.红椒，你跟初雨好，你说说，黄豆对初雨咋样？红椒听说好些人上黄家提亲，急得嚷道：咋会这样哩？我以为黄豆哥哥一准儿要娶初雨妹妹的。白虎将军一眯眼，便是罩着大红喜服，浑身上下洋溢着喜庆，也掩不住那凛凛虎威。故事发生在民国初年，老沈阳北市场有片杂八地，就跟老北京的天桥一样儿，走江湖的、做生意的，开洋行的，还有冒险家投机家等等，你方唱罢我登场，煞是热闹。　　不能再演奏钢琴的程岳，离开台湾到世界各地去流浪，后来落脚大陆上海，并和董小鹿意外重逢、两人从互相讨厌到彼此了解， 还发生…首档蜜孕生活真人秀，聚焦首胎孕妈的双重生活，三种不同类型家庭的孕期生活实录 。