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Public void add (TreeNode node) {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.美院教师项果沉浸在与恋人沈希伦相爱的幸福之中，然而就在项果与沈希伦准备结婚之际，身处与丈夫分居感情困扰之中的项果的母亲—黃静西意外发现沈希伦的母亲竟是她一直怀疑与自己丈夫有不正常关系的那个女人，黃静西坚决反对女儿与沈希伦的婚事，她认为如果女儿与沈希伦结婚是继丈夫之后对自己的又一次伤害和侮辱，同时作为母亲她也对女儿今后的婚姻命运担心不已。与沈希伦彼此相爱的项果理解母亲的心情却无法接受母亲的要求，项果最终决定与沈希伦结婚，黃静西对女儿的做法深感伤心和愤恨，她的情绪也变得更加忧郁极端和神经质，并与项果的感情产生了很深的隔阂和误解，与丈夫项康硕之间的关系也日益恶化，深爱着母亲的项果在爱情和亲情的选择之间痛苦难当。这一点尹将军不得不佩服，刘邦善于作伪，心理素质却也是极好的。Initialization status is: eggAs above, the code uses the policy pattern to refactor the code. It can be seen that the code responsibilities are updated clearly and the code becomes clearer.至于带兵的经验，所谓见微知著，从他管理粮仓的成效便可知道，他的管理如何，应用到带兵之中同样可以游刃有余。