https://blog.csdn.net/xiangbq/article/details/49755939
https://www.cnblogs.com/ShanHeDiao/p/4402030.html
三、关于vector大小(size)和容量(capacity)总结
https://blog.csdn.net/jisuanji198509/article/details/80757737
https://www.cnblogs.com/zwxblog/p/7788573.html
五、Dictionary类和Map类
Java数据结构 https://www.runoob.com/java/java-data-structures.html
Java map接口 https://www.runoob.com/java/java-map-interface.html
Java中的Dictionary类和Map类有什么区别?https://oomake.com/question/7604783
Java集合中Map接口的使用方法 https://www.cnblogs.com/jpwz/p/5680494.html
https://www.cnblogs.com/perfy/p/3820594.html
JVM内存结构——堆、栈、方法区、直接内存、堆和栈区别