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The combination mode is also called part-to-whole mode. The combination mode combines objects into a tree structure, which is used to represent the relationship between the whole and the part. The combination mode enables clients to treat individual objects and combined objects equally. For example, in. NET, simple controls such as WinForm controls, TextBox and Label inherit from the Control class, while composite controls such as GroupBox also inherit from the Control class. The specific structure diagram of the combination mode is shown below.Prospects for Deliberate Practice//304尹旭也不是那种憨实不懂情调的鲁男子，女儿家的心思多少也能把握些。He who gives up time, time also gives up him. -ShakespeareMany years ago, there was a product form called community + e-commerce. In my opinion, it is too difficult to do this fact well. It is already very difficult for communities or e-commerce companies to do a good job in one category. You can imagine this difficulty if you want to mix these two things together and do a good job.Public State getState () {