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解开谜团的过程颇有吸引力。此剧还重建死者被害时的现场，拍摄子弹如何在体内穿梭，血管、器官被破坏过程，逼真景观令人屏息。看了如此细致的破案手法，即使有犯罪的胆在以身试法时也要好好考虑。There are two categories: men and women.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:若不是看他在身边，又勇猛非常，那些护卫也不会离开他。该剧集结了易恒（饰欧阳羽生）、辛瑞琪（饰孙小柔）、倪言（饰楚路）、蔡宜达（饰高原）、刘洛汐（饰赵彬）、李嘉慧（饰徐静婉）、童话（饰米娜）等拥有“清新面孔”的新生代演员。男主角易恒曾在《那抹属于我的星光》中饰演小王子，被称为“最帅总裁”。女主角辛瑞琪更有“北电校花”之称，饰演楚路的倪言也被誉为“短发女神”。而蔡宜达曾参演多部作品，演技备受好评。全新人阵容将带来怎样的表现令人十分期待。User class unified interface, User1 and User2 are different objects respectively, and they are related. If the mediator mode is not adopted, the two need to hold references to each other, so the coupling degree between the two is very high. In order to decouple, the Mediator class is introduced to provide unified interface, and MyMediator is its implementation class, which holds instances of User1 and User2 to control User1 and User2. In this way, User1 and User2 objects are independent of each other. They only need to maintain a good relationship with the Mediator, and the rest is maintained by the MyMediator class! Basic implementation: