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Click the metering button,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.　　萝丝的真实身份为龙之少女，她的失踪在黑道上引起了轩然大波。为了夺回萝丝，黑道派出了邪恶的黑暗组织。在波折中，龙司逐渐发现了自己对萝丝的真正心意，为了保护自己所爱的人，他决定拿出勇气和力量，于黑恶势力决一死战H***u:这不再是关于明治剑客的浪漫谭，这是一个英雄迟暮的哀婉诗篇……3. Pass to child View----> Call super.dispatchTouchEvent () The default implementation will call onInterceptTouchEvent in onInterceptTouchEvent return false, and the event will be passed to the subclass.