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The difference between them is that each policy class in the policy mode is equal and parallel, and there is no connection between them. Therefore, customers must be familiar with the functions of these policy classes so that customers can actively switch algorithms at any time. However, in the state mode, the behavior corresponding to the state and the state has long been encapsulated, and the switching between states has long been stipulated to be completed. The "change of behavior" occurs within the state mode. For customers, they do not need to know these details. This is what state patterns do少女好像呆了片刻，这才断断续续地抽咽起来——梧桐相待老，鸳鸯会双死。刘邦似乎察觉到了妻子的异样表情，想要劝说却不知该如何启齿，正在此时属下来报，张良先生来访。还没进去里间，就听见脆笑声不断。Public TreeNode (String name) {Having a certain professional level, usually with independent diagnosis and treatment ability of deputy senior title or above;"Persimmon Dyed Blue"