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I. Classification of Design PatternsPublic MyIterator (Collection collection) {儿子，你就当出去游玩，身边还有两个美女相伴，这可是想不到的雅事。四段不同的爱情故事，一对人鬼恋 一对好友之恋，另外一对是暗恋之情!还有一对是排球社队友兼室友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:According to the "Special Provisions on Labor Protection for Female Workers", employers with a large number of female workers should, according to the needs of female workers, establish facilities such as female workers' clinics, pregnant women's rest rooms, nursing rooms, etc. to properly solve the difficulties of female workers in physical health and nursing.