jdk安装

linux:
vi /etc/profile

加入以下配置：

#set java environment

JAVA_HOME=/home/teddy/jdk/jdk1.8.0_171

JRE_HOME=/home/teddy/jdk/jdk1.8.0_171/jre

CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib

PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

export JAVA_HOME JRE_HOME CLASS_PATH PATH

window:

https://jingyan.baidu.com/article/154b463111e7f028ca8f41a6.html