https://www.cnblogs.com/dengyungao/p/7524960.html
https://blog.csdn.net/zolalad/article/details/11368561 https://blog.csdn.net/learn280668200/article/details/81284691
java集合框架
原文：https://www.cnblogs.com/lianggaoblogyuan/p/11478768.html
