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Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.Indoor fire hydrant pipe network form (ring-shaped and branch-shaped) and pipe diameter, number of fire hydrants, location and number of water pump adapters, and whether there is a roof fire water tank connected with this system.他可能一直盼着我们上门，别让宋令尹关注我们太紧，否则什么也干不了。Women's Day on March 8 is a legal holiday for some citizens. Those who work normally do not receive the same overtime pay as all citizens on legal holidays. However, in this way, there will be the same salary for working and not working on the same day, and some employees may refuse or take an excuse not to work if they have work needs. For the sake of fairness and reasonableness and to mobilize the enthusiasm of employees, in practice, most enterprises will generally independently stipulate overtime pay or rest for employees who work on the same day.Define two implementation classes respectively:Statement from Criminal Zhang Xuejun