https://docs.oracle.com/javase/7/docs/api/overview-summary.html
https://docs.oracle.com/javase/8/docs/api/
https://docs.oracle.com/cd/E23943_01/web.1111/e13712/sessions.htm#WBAPP301
https://blog.csdn.net/stevendbaguo/article/details/51459599
https://cn.bing.com/
原文：https://www.cnblogs.com/guanghuiqq/p/8987878.html