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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:莫小妍在体检中被查出罕见的肝脏疾病，通过调查得知林峰与自己相匹配。在莫小妍不断接触下林峰终于接受了她的提议，但由于林峰有些许贫血需要一定的锻炼和营养，莫小妍便给林峰准备了漫长的计划。而俩人也在这段时间暗生情愫。莫小妍生日当天，林峰在地下室看到了一辆车的车牌号备受打击，原来莫小妍就是4年前的肇事司机，而那场车祸导致林峰手背经断裂，无法弹奏，妹妹也因此失明。俩人再无联系。两个月后，妹妹接受了捐献重见光明，而捐献者竟然是莫小妍。林峰看到不能自理的莫小妍，发觉自己其实已经爱上了她，便决定和莫小妍进行肝脏移植手术。杨长帆双掌一拍，就此信口开河，我这边传出消息，徽王招亲，选美，选贤，无论出身贵贱。(2) When the NIO thread is overloaded, the processing speed will slow down, which will lead to a large number of client connections timeout, which will often be retransmitted after timeout, which will further increase the load on the NIO thread and eventually lead to a large number of message backlogs and processing timeout, thus becoming the performance bottleneck of the system;齐天大圣与四亿八千万血神子僵持住。IBM's Price agrees.3. Easy integration of other Software as a Service (SaaS) applications