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The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:这，不正是张经曾经的遭遇么？哈哈哈……胡宗宪绝望地大笑起来，没有傻子。Public int calculation (int num1, int num2) {7. Do car beauty shops deodorize and maintain beauty shops? Like to make a whole car? Deodorization and cleaning, this effect is also wrong? .敌后抗日武工队是华北抗日战场上最闪亮的传奇，高风亮领导的定西县抗日武工队坚持敌后抗战，随时出击神出鬼没，如同一把尖刀插在鬼子心里，让鬼子时时心如刀绞，痛不欲生。抗战后期，鬼子进入最后的疯狂，为剿灭武工队，定西鬼子特战队队长冲田新八，多次设下圈套，敌方汉奸队、鬼子特务大队，甚至我军情报站，都成为了冲田新八的诱饵。高风亮在鬼子陷阱面前率领战士们一次次虎口脱险的同时，完成了护送首长、定点锄奸、爆破军火库等任务，给鬼子以迎头痛击