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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:Industrial software such as MES (Manufacturing Execution System), APS (Advanced Production Scheduling), PLM (Product Life Cycle Management), ERP (Enterprise Resource Planning) and Quality Management are widely used to realize visualization and transparency of the production site. When a new factory is built, the digital factory simulation software can be used to simulate the layout of equipment and production lines, factory logistics, ergonomics, etc. to ensure the reasonable structure of the factory. In the process of promoting digital transformation, it is necessary to ensure the data security of the factory and the security of equipment and automation systems. When defective products are detected through professional testing equipment, not only should they be automatically separated from qualified products, but also the causes of quality problems can be analyzed through SPC (Statistical Process Control) and other software.他把徐风的手放到沙发上，继而叹口气又说：已经Lang费了一年的时光，你也不小了，我不想你再平白Lang费剩下的两年，放弃吧，我不可能爱上你。吴美丽向来心无大志，嬉戏人间。因一次仗义出头被大耳窿追债而结识常温，二人惺惺相惜，温提议丽到他家里暂避风头，岂料途中又倒霉遇上车祸。丽侥幸无恙，温却重伤昏迷。 凤斗智随之而起。女青年顾晓月在公交车站看到一只没人要的小金毛犬，在爱心的驱使下，她将狗狗带回了家取名哈林”。顾晓月带哈林去宠物医院看病的时候结识了宠物医生李哈林，李医生发现哈林聪明懂事，决定训练哈林。经过一番训练后哈林学会了很多技能，帮助顾晓月做家务、拎东西等。一次顾小月带哈林散步，哈林勇敢的帮助房东抓住小偷抢回了被偷走的包包，在公园玩耍时发现了被遗弃的小孩。哈林的行动深得人们的喜爱，它成了这座城市狗届的明星和英雄，还上了报纸。后来，哈林被邪恶势力偷走，欲将其杀死，未曾想却牵出一起国际犯罪案件。顾晓月、李医生和一大批爱心人士展开了一场营救忠犬的行动，最终救出了哈林和其他被偷的狗狗，让它们都有了一个温暖的家。讲述洪吉童创建的栗岛国一名道士“田禹治”因朋友的背叛失去像父亲般依靠的洪吉童，且他心爱的女人也死去，田禹治为了报仇而到朝鲜王朝后发生的故事