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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:现在还是不敢放你们，怕你们万一有个闪失，麻烦可就大了。奎河的水静静地流淌着，波澜不惊，恬淡安静。在第一集解决了“毁灭钢眼博士”后，“神奇四侠”已经逐渐适应了新的身份，队员们的生活亦过得有滋有味 。里德和苏珊终于步入教堂，然而，正当婚礼进行到一半时，突然狂风大作，一道银色闪电在天空闪过。里德忙叫“霹雳火”追上去看过究竟，熟料“霹雳火”完全不是对方对手，里德的担忧变成了现实：新的敌人出现了――“银影侠”！琴棋书画、诗词歌赋、品茶煮酒、曲艺非遗、国学孝道、民俗婚俗。一会看着秦枫叫一声皇叔，一会又有看着肃王叫一声皇兄，简直不知如何是好了。When starting up, after the system self-check is completed, press F8 continuously until the "Start Menu" appears. Use the cursor to select, select the first item, and press Enter to enter.