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他的儿子共尉曾经和我交朋友，更多地还是看重我的身份。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:　　在雅丽消失的日子里，赵强当上了一名银行职员。他一直没有放弃寻找雅丽，但他雇佣了私家侦探也找不到雅丽的下落。某天，雅丽的突然出现使赵强兴奋不已，但雅丽是来道别的。不好吧。内地企业家苏礼到香港发展，欲与安信旅游集团合作开发香港独一无二的生态度假村。在安信旅游集团主席顾东海为从美国留学归来的儿子顾浩民举办的酒会上，香港十大富豪之一的韦卡斯对苏礼狠狠地说：“感谢您在内地指证我的儿子，使他锒铛入狱，我决不会放过你“……　　他赤條條去，他赤條條來，心裏到底糊塗還是明白。