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The general code is like this, and I feel that the code using the intermediary mode is similar, so I won't introduce it much here. The code in the book has advantages, but I don't feel that there is much difference, so I no longer use the intermediary mode to write code here. State mode is an unusually excellent mode, which may be the best way to solve some requirement scenarios. Although the state mode is not a simple to clear mode (it often brings about an increase in the amount of code), once you understand the essence of the state mode, you will certainly thank it for its incomparable benefits in the future. The key to the state mode is to distinguish the internal state of things. Changes in the internal state of things often bring about changes in the behavior of things. This article describes the state mode in detailTelecommunicationsFirst of all, let's look at Baidu's interview. So we can define a constructor first.The Original class is the original class, which contains the attribute value to be saved and creates a memo class to save the value value. The Memento class is a memo class, and the Storage class is a class that stores memos and holds an instance of the Memento class. This pattern is well understood. Look directly at the source code:女娃么，除了穷人家，谁也不乐意把闺女送去医学院，在他们心里，闺女进医学院，将来就是一稳婆，跟大夫差老远。就是这样平稳建成的过程中，突然有一天，杨长帆紧急下令一半舰船出航北上，他的意思是夜观天象，这一天咱们的航线会出事。