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Threads a > A and B enter the first if judgment at the same time. B > A enters the synchronized block first, and since instance is null, it executes instance=new Singleton ();First click the Start button in the lower left corner of the screen (or press the Win button on the keyboard), then directly enter "PowerShell" to see that the system automatically searches for a desktop application named "Windows PowerShell", then right-click it and select "Run as Administrator". You can open the Windows Powershell program as an administrator.　　"不能实现梦想的人生就是失败的？""不，不管什么工作，只要全力去做，就能获得无穷的快乐！""无趣的工作，万岁！"否则还不知道会发生什么呢，如今暂且留着他们的性命也算是一点回报吧。1900年，斯文·赫定与斯坦因在沉睡千年的罗布泊荒原发现了楼兰古城，从此，在这个神秘而古老的文明遗址上上演了一幕幕现代文明人贪婪的悲剧。带着对千年不腐的楼兰女尸、堪与埃及法老图坦卡蒙金色面罩媲美的金色面具等无数古墓宝藏的好奇和贪婪，他们不顾绿洲已变成荒原的大自然警示、不顾守墓者断臂挡道、白骨不倒的悲壮、不顾曾经作恶者的忏悔，以自己的疯狂引发了带血的诅咒。The essential problem with this pattern is that it relies heavily on threads, but threaded Java Virtual Machines are very valuable resources. With the rapid increase of concurrent visits on the client side, the continuous expansion of the number of threads will sharply reduce the performance of the server side.Sichuan Province