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After a period of time, I gradually felt the design pattern and was able to find some application scenarios of the design pattern. And often apply those models, gradually deepen the understanding of the model, and turn it into their own things, can be used flexibly in other places.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:这是一个关于一群小屌丝的伟大构想，五个不靠谱的成员，一个“求必应”的帮忙公司，帮助甲方实现梦想，搞定难题，满足各种奇葩甲方的各色需求，演绎最当下的大荒诞，小真实。公司口号：求必应！求必应！一切问题都搞定！过程中，有不懈努力的成功，也有滑稽可笑的失败，演绎了一段爆笑连连的欢乐人生。PS: Taidao Bleeding of Sword Soul in Version 80 is a special case. Due to the problem of Taidao proficiency, white characters can trigger bleeding. Any skill in any other profession need not be considered for this (white characters)1. Normal life cycle:第四次长沙会战结束，二龙的部队被打散，他带领一帮弟兄们回到安徽老家，准备和日本人打游击。新四军派出特派员李空山也在平坝镇周围活动，他的任务是找到当地自卫队的首领杨士奇，争取改编他们一起抗日。二龙救下了遭遇日军扫荡的李空山，却无意中误伤了自卫队的杨士奇。李空山说服二龙和自己一起去找杨士奇，二龙的身份却遭到了杨士奇的质疑。日军发起了大扫荡，在李空山的说服下，二龙和杨士奇终于加入了新四军的游击队。游击队接到命令，要去配合一次大规模的反扫荡战役，二龙和李空山决心带着自己的弟兄们留在平坝镇，拖住鬼子主力，掩护杨士奇带领游击队主力前去作战。最终，二龙等人与前来扫荡的日军同归与尽，抒写了一段抗日的传奇。