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This article discusses each type of attack in turn, provides specific examples, and discusses possible mitigation methods.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:Thank you for reading, this is Dragon de Boat Man"They will never give up halfway, try different ports, different protocols or carry out attacks from new sources. In short, they will never give up until they reach their goals. Tactics are always changing," he pointed out. "Enterprise users must understand and prepare for this fast and flexible feature of rivals."她就站在堂屋，等一曲吹完，才笑着走进去。《密战太阳山》围绕错综复杂的谍报较量以及游击队与老百姓出生入死、顽强保卫我党地下工作的艰苦卓绝的斗争，不但呈现出了闽北山城抗日谍战的全景式画卷，更表现了地下工作者的机智、勇敢、忠诚，以及共产党与人民的水乳深情。本剧讲述的是19世纪末叶在位于柏林最大的历史最悠久的医院“夏绿特”里一些著名医师和科学家的丰功伟绩。