Ubuntu切换JDK版本

切换jdk选项

sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_211/bin/java 700
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_211/bin/javac 700
sudo update-alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_211/bin/jar 700

环境变量

# 查看当前环境变量
echo $PATH
# 编辑环境变量
vim /etc/profile
# 环境变量生效
source /etc/profile