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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.Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, we often use office software Office XP, drawing software Photoshop, game software Red Alert and so on.The crossroads of life are full of seemingly small but actually key choices. Deliberate choices determine the success or failure of life. You should have drunk enough chicken soup for the soul and listened to enough success stories. The book "Deliberate Choice" is like a pair of noise-reducing headphones, which has helped you block suggestions that seem correct but have no practical value. This is an easy and easy-to-read inspirational book, which aims to guide readers to break through habitual thinking and change their work, life and social life from deliberately choosing different behaviors. Best-selling writer Rocht Balgava provides 15 simple, practical and easy-to-operate life algorithms in his book to help you successfully break through the dilemma of life. So, how do you start? Of course, let's learn to eat with our left hand first!(can be superimposed)Above, by registering one or more delegate instances for the event with + =, in fact, you can also directly register methods for the event.书生们拜谒师长，相会同窗，吟诗作赋，弹琴吹箫，饮酒高歌，自有一番盛会气象。