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This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:秦涛急忙赞成道：好。202. X.X.51Ctrl + C: Copies the selected object to the clipboardAt this time, it is necessary to consider whether the new activity is opened in the same task stack as your own App or in the new task [this is very important because in Android mechanism: the life cycle of the activity in the same task stack is associated with this task [see below for specific examples]], and then consider the startup mode of the activity; Therefore, Android provides a higher priority setting method in Intent.setFlags (int flags), through which you can set the task stack and startup mode for opening the activity in the third-party App, and look at the source code for the specific settings.5.5 Drug addiction and alcohol addiction are not qualified.她拍着桌子对刚赶来的张槐和郑氏质问道：你们是死人哪？那老婆娘敢这么搅和，你们就应该骂上门去，看她还敢捣鬼。