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6. Use Your Customers to Find CustomersNext, we will enter the code writing phase of the state mode. First, we will define three state classes, namely offLightState, WeakLightState and strongLightState. All three classes have a prototype method buttonWasPressed, which represents the behavior that will occur when the button is pressed in their respective states. The code is as follows:Advantages: Adding a new operation is easy, because adding a new operation means adding a new visitor, and the visitor pattern centralizes the relevant behaviors into a visitor object.因为盛淮南，洛枳一路追随，考上了最好的大学。因为各种机缘，洛枳和盛淮南终于走近。但成长的过程和现实的压力，让两人接受了很多考验，两人是否能走到一起，洛枳的日记本到底是被谁捡取，盛淮南的家庭是不是有变动。洛枳对盛淮南的爱，到底在面对现实的考验时，会不会坚持下去，在家庭和爱情的面前，这一场暗恋，会不会无疾而终。Introduction: Smiling back somersault, use it when winning joy.因此项伯这心中早就有些怨恨，只是一直没有机会发泄出来罢了。郑青木说，小葱两月前捎信回来，说是年前肯定会到家。