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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.这部由《蠢驴和坏爷爷》的制片人拍摄的隐藏式摄影机喜剧讲述了两位好朋友在一次充满搞笑和创意恶作剧的越野之旅中，把现实生活中的观众拉入混乱之中。We can call this object that specializes in Pizza a factory. Take a look at the implemented code:红椒道：只管说。灭绝师太就此罢手，如何？张无忌扫视一眼峨眉弟子，然后看向灭绝师太，朗声说道。尹旭略微的沉吟之后，说道：微服出去吧。Fires cause huge losses to people's lives and property in our country every year. The application of flame retardant fabrics can effectively delay the spread of the fire. Especially in public places, the use of flame retardant fabrics can avoid more casualties. The difference between flame retardant fabric and ordinary fabric is that it can reduce the burning speed of textile materials to different degrees and stop burning quickly after leaving the fire source, which can reduce fire accidents caused by textiles and avoid unnecessary losses.