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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 detailHttp://www.jiemian.com/article/2145181.htmlSecond: Create a subclass...为修建云贵战略大铁路，20万铁道兵向西南边疆大进军。铁道兵A师铁锤团参谋长秦群在坐了5天禁闭后，临危受命赶赴先遣营任营长。先遣营所去的金龙江地区临近金三角，民情社情复杂。师长告诫随时准备在两条战线上同时作战……3. After the shadow stops moving, the player needs to return to the original road to the side of the moon mark.