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This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:"Well-how do you say this? According to the appearance, it should be a dog, but the dog is very ugly. I don't recognize what breed it is, and I have never seen such a fierce dog." Liu Guangyuan said.只是这时候陈启已经溜进厨房了。毛骗，意思是指街头的小毛骗子，他们有组织有纪律，混迹在城市的边缘。他们是骗子，是侠盗，是不法份子，或者他们没有高尚品德，但是有职业操守，他们的目的不仅仅是为了钱。他们是高智商的艺术家，精密算计着每一步的计划，锁定目标，制定计划，精心布局，诱敌深入，最后把贪婪好色和为富不仁者收入网中。小偷看不起强盗，因为强盗没有技术含量；骗子看不起小偷，因为小偷没有艺术含量。每一件事，只要到了极致，就是一种艺术。这是一面镜子，反映社会的另一个层面。有些东西也许我们都看不到，但是我们都听说过，这是当下的故事，未来的传说。此为毛骗第二季。Around these problems, Rui Yi interviewed the founders of some children's thinking ability training institutions, parents who have invested capital in this field and have let their children receive thinking ability training.(Ha ha, it doesn't matter if there is no absolute path here, but the format must be paid attention to)