自己总结的一些Java基础学习的笔记，都是自己一点一点的看书，看视频总结，有些可能自己的见解，但是不一定对，不对的地方请大家指出。-Own summary of some of the basics of Java study notes, are their own little bit of reading books, watching video summary, some may have their own opinions, but not necessarily right, w