uos系统切换java版本

查看当前java版本

java -version
#输出结果
openjdk 11.0.9 2020-10-20
OpenJDK Runtime Environment (build 11.0.9+11-post-Uos-1deb10u1)
OpenJDK 64-Bit Server VM (build 11.0.9+11-post-Uos-1deb10u1, mixed mode, sharing)

安装jdk8

apt install openjdk-8-jdk
rm -rf /usr/bin/java
ln -s /usr/lib/jvm/java-8-openjdk-amd64/bin/java /usr/bin/java
#再次查看java版本
java -version
#输出结果
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (build 1.8.0_212-8u212-b01-1~deb9u1-b01)
OpenJDK 64-Bit Server VM (build 25.212-b01, mixed mode)