1 Mysql面试大全 https://www.cnblogs.com/cxiaocai/p/11634257.html 2 JVM虚拟机面试大全 https://www.cnblogs.com/cxiaocai/p/11634918.html 3 HashMap和Hashtable有什么区别及线程初探 https://www.cnblogs.com/cxiaocai/p/11081041.html