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　　三个人，贡献出三个福尔摩斯‘华生嘴里的福尔摩斯、柯南·道尔笔下的福尔摩斯和杰锐莱·布莱特扮演的福尔摩斯。The citizens of Hope Valley make arrangements to help the recently displaced settlers, during the Christmas season. As they make preparations, a peddler comes to town selling his wares.Public class TreeNode {Note a few points: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.The system configuration change here refers to the change of activity life cycle caused by the switching of horizontal and vertical screens, thus causing the change of resources. In Android, system configuration changes will cause activity destruction and reconstruction, such as horizontal and vertical screen switching, but the switching time difference is too small for the user's eyes to detect. When the activity is rebuilt, just before the previous activity is destroyed, the system will call onSaveInstanceState (Bundle outState) to store various states at that time. In the new activity, Android will read the data through onRestoreInstanceState (Bundle savedInstanceState) and automatically restore to the View of the previous activity. Of course, in the activity, the developer's own code logic needs to be processed by himself.