https://www.cnblogs.com/111testing/p/6602603.html
https://blog.csdn.net/qq_33280890/article/details/73755553
数组(array):长度固定,元素都是同一类型,可以存放基本数据类型
容器类(ArrayList, LinkedList,HashSet,HashMap,Vector, ): 长度可变,可以存放任意类型的对象,如果存放基本类型数据需要包装类(Integer,Double等)
ArrayList LinkedList Vector区别,HashMap Hash
https://www.cnblogs.com/jinlinFighting/p/5775281.html