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啊？吴臣有些惊讶，看着尹旭凝重的表情，感觉此话并非危言耸听。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:萧何也清楚，其今日的事情是无论如何也躲不过了，既然如此，那就只能够硬着头皮上了。这是？老丁看了看这堆东西，随后一拍脑袋，我知道了。　　James的女友Suki（张敏 饰）是一家公司的白领，其老板黄威廉与李绍邦互有勾结。John趁Suki随老板与李谈生意之际放入窃听器，得知李、黄以及陈德信等人的暗箱勾当。然当晚陈离奇身亡，次日调查科逮捕黄，黄却被当街射杀。黄手中掌握一份攸关李之命运的重要文件，这份文件也便成为案件侦破的关键……然而，胡家抵死不承认。AP or A