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Singleton is a common design pattern. In Java applications, a singleton object can ensure that only one instance of the object exists in a JVM. This model has several advantages:《如果是她的话》是讲述整形外科医生韩江宇 (金载沅饰)，和进行了换脸整形手术的池恩寒 (南相美饰) 的悬疑爱情剧，以及变脸后连记忆都消失了的女主，在回忆中找寻自己时所引发的甜蜜杀戮悬疑爱情故事。预计接档《Secret Mother》7月播出。The above data tell us that the basic attack of weapons is very important. I hope the above analysis can provide help to everyone. Please pay attention to the quality when posting back.该剧讲述在各自的位置过着不同个性生活的4个人，因为一个事件而纠结起来的故事。不用客气，尽管吃喝，如果不够，随时唤人来添加。The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?