1.cash用法
参考http://blog.sina.com.cn/s/blog_4c538f6c01012mzt.html
2.NIO实现聊天服务器
https://www.cnblogs.com/hust_wsh/p/5162412.html
3.ActiveMq
入门 https://www.cnblogs.com/jaycekon/p/6225058.html
详细 https://www.jianshu.com/p/ecdc6eab554c
https://www.jianshu.com/p/f7a7105b3c27
https://www.jianshu.com/p/79f8a0457069
4.集合遍历增删元素报错原理ConcurrentModificationException
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参考https://www.cnblogs.com/dolphin0520/p/3933551.html
5.sleep和wait的区别
http://www.cnblogs.com/hongten/p/hongten_java_sleep_wait.html