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A professional brokerage firm can make you get twice the result with half the effort. Including resources, experience, technology, etc.I. Introduction(未完待续……) show_style();。暮色中，小苞谷呆立不语。Specify the types of objects to be created with prototype instances, and create new objects by copying these prototypes. That is, implement the Cloneable interface and override the clone () method.Third, exit the recovery mode.Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.