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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.Technical Data of Strength Lifting WeightliftingExtras and flags are too familiar to repeat.安世敏,清末民初社会底层的落拓平民知识分子,安世敏的故事在重庆民间乃至江流域广为流传，可说是家喻户晓，具有相当高的知名度。这位民间传说中的机智人物既有“智慧化身”的美誉，又有“整人大王”的恶名；他即有正派、耿直、机智、幽默的美好品格，又有躁动、报复、好作弄人的人性弱点；其为人集才气、灵气、豪气、痞气于一身，真令人爱恨交加。整人似乎是安世敏的最大爱好，成了他生活之必需，而且他整人是向来不加选择的----无论官府豪强、丑类恶行还是亲朋、邻里、舅爷、老表、乃至生父、岳父……凡是他看不顺眼的人和事，无不整之而后快。作为一个有志向的谋士，他自然希望汉王能够机会出巴蜀，去寻求更大的发展，去争夺天下。? Set the methods in the above multiple factory method modes to static, and call them directly without creating instances.入学倍率10～20倍，不仅是学科考试，身体·运动机能检查等资质也被问的窄门。