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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:吴争，民航机长，拥有令人艳羡的职业和外型，飞行中他技术过硬，承载无数乘客的责任。生活中他天性不羁爱自由，恣意挥洒，不管他人眼光。在自己的世界里，做个彻头彻尾的老男孩。直到有一天，一个 16岁的儿子从天而降，一个正义的女老师林小欧紧随其后，两人前后脚的到来，彻底颠覆了吴争既有的生活。林小欧，无忧无虑的乐天派，时髦得有点用力，正义得有点莽撞，她是学生们亲切的姐姐、爽朗的朋友和没架子的好老师。当得知得意门生萧晗突遭家变，成了无家可归的孤儿，她费劲心力要与孩子生父沟通，当她见到了孩子生父才发现，原来，他就是自己不久前海外旅行时的噩梦——处处和她作对、极不靠谱的吴争这也就是为什么杨寿全急着让儿子捐功名的原因，有了这层保护壳，终究好过一点，但面对沥海所，这还太脆弱了。李峰手脚激动得颤抖、血开始沸腾、眼中有一团火在燃烧，他终于看到了自己心目中的张无忌。丢下他就往红椒这边来。故事要从二十年前说起，一场意外中，宋家爷爷（陈博正 饰）成为了柯家奶奶（谭艾珍 饰）的救命恩人，正巧两人的媳妇都怀有身孕，于是，在尚未出世之前，两个小小的婴儿便被指腹为婚。