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Red: safflower, madderD > 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:Neurodermatitis, eczema, psoriasis and idiotic wind were assessed individually.国际刑警联合泰国军队，火烧金三角中断毒品来源，黑帮、毒臬联手报复，派人潜入刑警档案室，盗取刑警档案，刑警每出动一人，便即遭暗杀，黑帮为补偿损失，进行一名为“黑色十字”计划，刑警苦无良策下，得美国毒品调查可资助，雇请织协助对抗，惟是黑帮人强马壮，织只能智取抗敌，一场海、路、空大决战便即时爆发。怎么，往常你们跟着旁人出去就没死过人？每次都能好手好脚地回来？我呸，没准死的更多。There are too many new problems in Meng … (in fact, he is an old driver, but he just started playing in Mansan). Just played for half a month. Seeing the grade gap with everyone, I am desperate, but I really like the three countries too much... in fact, it is also a good thing, without competition, there is not so much pressure. Riding a donkey and a horse, I used the news to guard the border.There are three kinds of factory modes: simple factory mode, factory method mode and abstract factory mode. All three solve one problem, that is, the creation of objects. Their duty is to separate the creation of objects from the use of objects.