linux 下安装 jdk

1. 下载 jdk ：

https://www.oracle.com/technetwork/java/javase/downloads/index.html

2. 解压 jdk 到系统默认 jdk 路径：

sudo tar -zxvf jdk-8u191-linux-x64.tar.gz -C /usr/lib/jvm

3. vim ~/.bashrc 追加

# set oracle jdk environment
export JAVA_HOME="/usr/lib/jvm/jdk1.8.0_191"
export JRE_HOME="$JAVA_HOME/jre"
export CLASSPATH=".:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH"
export PATH="$JAVA_HOME/bin:$PATH"

4. source ~/.bashrc

source ~/.bashrc