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回来上课啰！新一季裡到处都是粉红泡泡！《伊格雷西亚斯老师》新集数将于 12 月 8 日在 Netflix 独家上线。Application scenario of proxy mode:(3) Double check lock当三剑客以为危机解除，未曾想四大恶贼的幕后主使东方求败出现！面对企图颠覆水果江湖的东方求败和四大恶贼，三剑客与疯清扬等人与他们在七界山莲花处展开了一场惊天动地、事关水果世界存亡之战。最终，三剑客等人与东方求败和四大恶贼同归于尽，用生命守护了水果世界。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:It can be said that if you have taken the subway in China, there is no problem taking the subway in Nagoya.