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/shoo (expulsion)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:Junho是一个即将死去的吸血鬼。为了生存，他需要喝纯净的血液，从而成为一个人。有一天，在搜索www的时候。cc为这纯正的血液，他遇见了敏贤。但是另一个名叫海洙的吸血鬼，知道小君的创伤，导致了民铉和小君浩的争吵。作为一个人过着正常的生活，保护民贤，俊浩将不得不面对什么？There are two iPhone recovery modes, one is DFU mode and the other is recovery mode.The basic structure of the code is seen above, but we also need an initialization method. The code is as follows:又有跟葫芦板栗要好，帮着他们的。林兄弟确是个洒脱的人。