1. sudo /etc/profile
jdk1.8.0_212下载地址
https://download.oracle.com/otn/java/jdk/8u212-b10/59066701cf1a433da9770636fbc4c9aa/jdk-8u212-linux-x64.tar.gz?AuthParam=1561435550_7e7a0b6959aadda1479dc967eaa459df
控制台输入 source /etc/profile 使其生效
2.安装截图配置
输入javac 进行验证
