心血来潮，忽然忘记java环境怎么配置，jdk怎么下载了……
贴两篇文章：
https://www.cnblogs.com/nojacky/p/9497724.html
https://blog.csdn.net/weixin_28724003/article/details/114157778
然后附上oracle的官网下载地址
jdk1.8：https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
然后各个版本的jdk：https://www.oracle.com/java/technologies/javase-downloads.html
ubuntu安装java环境：
https://www.linuxidc.com/Linux/2017-02/140908.htm
mac安装java环境：
https://www.cnblogs.com/itgezhu/p/11086709.html
https://www.jianshu.com/p/194531d106ae
