🦃 更换jdk
```
sudo rm /etc/alternatives/java
sudo ln -s /usr/lib/jvm/java-17-openjdk-amd64/bin/java /etc/alternatives/java
jdk-11.0.18
```
```
# ~/.bashrc
JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
JAVA_HOME=/usr/lib/jvm/jdk-11.0.18/
```