Centos多版本Java切换

我在/root/tools/java目录下下载了两个Java的安装包

alternatives --install /usr/bin/java java /root/tools/java/jdk-21.0.3/bin/java 1
alternatives --install /usr/bin/java java /root/tools/java/jdk1.8.0_411/bin/java 2

Javac同理可以更换

alternatives --install /usr/bin/javac javac /root/tools/java/jdk-21.0.3/bin/javac 1
alternatives --install /usr/bin/javac javac /root/tools/java/jdk1.8.0_411/bin/javac 2

需要把之前配置的环境变量删除：

使用：

alternatives --config java

删除：

alternatives --remove java /root/tools/java/jdk-21.0.3/bin/java
alternatives --remove java /root/tools/java/jdk1.8.0_411/bin/java