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(1) The cost of thread life cycle is very high. The creation and destruction of threads are not without cost. In an operating system such as Linux, a thread is essentially a process, and creation and destruction are heavyweight system functions.1. State patterns define the relationship between state and behavior and encapsulate them in a class. By adding new state classes, it is easy to add new states and transitionsDepending on the profession you intend to enter, you can choose a single course, certificate certification, or diploma in a certain field, such as network or program. The best plan for learning is to weigh your strengths and weaknesses, and then purposefully find and choose schools. The second half of this series will introduce in detail how to choose IT schools.伯父、阿姨、许岚。At 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.Ctrl + J: Repeat the previous command