Java JDK 多版本切换

#环境变量参考

 export JAVA_HOME=/opt/jdk-18
 export CLASSPATH=.:${JAVA_HOME}/lib
 export PATH=${JAVA_HOME}/bin:$PATH
#
#export JAVA_HOME=/opt/jdk-8/jdk.1.8.0_202
#export CLASSPATH=.$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
#export PATH=$JAVA_HOME/bin:$PATH
#unset _JAVA_OPTIONS

 

# Install

sudo update-alternatives --install /usr/bin/java java /opt/jdk-18/bin/java 1  # 数字1 代表优先级
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk-18/bin/javac 1  

# Set

sudo update-alternatives --set java /opt/jdk-18/bin/java

sudo update-alternatives --set javac /opt/jdk-18/bin/javac

# Switch Version

update-alternatives --config java