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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:为了对传说中的撒旦博士进行调查，杰瑞（Chris Hardwick 饰）和玛丽（Jennifer Jostyn 饰）、比尔（Rainn Wilson 饰）和丹尼丝（Erin Daniels 饰）这两对情侣驾车行驶在某乡村小路上。他们来到一个荒无人烟的地方，且遭遇狂风暴雨，万般无奈之下，他们躲进了一幢破旧的房子内。View's onTouchEvent () consumes the down event, other defaults.I like this kind of popular scienceInstead, he came to the International Students' College, held many foreign students back and asked the same question in English every time. In this way, he can hear the same answers from the students again and again.《神烦警探》起死回生，NBC接盘续订新一季#兼具破案和搞笑一体的剧集《神烦警探》最近命运可谓和它经常有些无厘头的剧情一样了。昨天Fox宣布取消续订该剧第六季，这让该剧的广大粉丝们心碎不已，立刻发起了续订请愿。据悉，Hulu Netflix均曾有意向接手该剧，但最终都不了了之。好在随后，主创Michael Goor宣布NBC正式接手该剧。NBC将续订剧集第六季，共12集。NBC曾经是非黄金时段喜剧霸主，但近几年逐渐将发展重心转移到了真人秀和长时程剧集上，此次接手《神烦警探》的确让小编有点惊喜。NBC高层Roger Greenblatt对此解释：之前把这部剧卖给Fox之后，电视台就一直很后悔；趁此机会，电视台就出手让这部剧带回到合适的家了。陈启在一旁看着，心里突然感觉怪怪的。