1. HashMap 和 ConcurrentHashMap 的实现原理是怎样的？

      1.  HashMap                 ConcurrentHashMap<br />并发          no                             yeah

    Desigh Pattern:https://blog.csdn.net/qq_24309787/article/details/82257772?utm_medium=distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromMachineLearnPai2~default-2.control&dist_request_id=&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromMachineLearnPai2~default-2.control

    Dead lock in thread pool:
    https://www.cnblogs.com/ywzbky/p/10725715.html
    线程池里的线程等待等待队列里的线程执行，等待队列里的等待线程池里的完成，相互等待
    https://www.jianshu.com/p/58f66be5cd94?utm_source=desktop&utm_medium=timeline
    https://blog.csdn.net/weixin_34008933/article/details/93314037?utm_medium=distribute.pc_relevant_download.none-task-blog-baidujs-1.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-baidujs-1.nonecase