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3. We can also manually specify the starting position of the node, which does not mean that we have to start from the actual node.现在正在布置太行山的防线，尉缭先生亲坐镇那处。150. X.X.1The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:Proxy mode refers to providing a proxy to an object and controlling access to the original object by the proxy object. The specific structure diagram is shown below.Provides a global access point. Q: How will it be realized? A: Create a static method that returns this class of objectsIn spring, they dressed in lovers' clothes and dressed delicately, went for a outing together.