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Create a new directory named "lib" and add the necessary jar package to import the project.The same case can be used in other products, such as tourism. After the order is placed, the user still needs to make strategies, check what he needs to bring, and matters needing attention, etc., which can be pushed to the user.Some common behavior methods will be defined in the state class, and Context will eventually delegate the request to these methods of the state object. In this example, this method is buttonWasPressed. No matter how many state classes are added, they must implement the buttonWasPressed methodEst (2, true, 500); This method does not match from the first node order500 in the chain, returns the success string, and then this.success & & this.successor.passRequest.apply (this.success, arguments); Execute this code; As we said above, the attribute this.Successor refers to two methods, order200 and orderNormal, so the method order200 is called, so the value is returned, and so on. Then if we want to recharge 300 yuan's red envelopes in the future, we can write the function Order300, then list the chain chain and package it, and specify the order in the responsibility chain. The business logic inside does not need to be processed.她和板栗说着话，不时抬眼看他，似乎并不恭敬，很随意的模样。