Linux 下多个Java 版本切换

java环境变量设置:

查找文件 find / name java

root@kali:/etc# update-alternatives --install /usr/bin/java java /etc/jdk1.8.0_181/bin/java 1
root@kali:/etc# update-alternatives --install /usr/bin/javac javac /etc/jdk1.8.0_181/bin/javac 1

切换jdk版本为当前版本

update-alternatives --config java

下面为火狐浏览器Java部署插件

root@kali:/etc# update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so mozilla-javaplugin.so /etc/jdk1.8.0_181/jre/lib/amd64/libnpjp2.so 1

火狐浏览器Java部署插件

root@kali:/etc# update-alternatives --set java /etc/jdk1.8.0_181/bin/java
root@kali:/etc# update-alternatives --set javac /etc/jdk1.8.0_181/bin/javac
root@kali:/etc# update-alternatives --set mozilla-javaplugin.so /etc/jdk1.8.0_181/jre/lib/amd64/libnpjp2.so root@kali:/etc# java -version

火狐浏览器访问

https://www.java.com/en/download/installed.jsp