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The half-time break in other basketball matches is ten minutes.In this example of abstract factory, there are two specific tables (user and dept) and two processing methods (SQL and access). According to the processing method, it is divided into two factories. Each factory has two abstract table processing, and each table processing is an abstract.D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:本剧改编自播客《Slow Burn》第一季，聚焦水门事件丑闻背后不为人知的故事和被遗忘的人物——从尼克松总统笨手笨脚、投机取巧的下属，到帮助、教唆他们犯下罪行的狂热派，以及最终导致整个腐败团体下台的吹哨人。精神不太好，是在为下一本小说的事而忧心？看着吕馨有些担忧的眼神，陈启摊摊手，说道：你想到哪里去了？对我而言，最没有难度的事就是写小说了我带人出城去训练好了。