命令行工具为：
root@ns524146:~# apt install temurin-21-jdk
选择版本
运行下面的命令来选择需要的版本。
sudo update-alternatives --config java通过移动上下键盘即可。
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/temurin-21-jdk-amd64/bin/java 2111 auto mode
1 /usr/lib/jvm/temurin-17-jdk-amd64/bin/java 1711 manual mode
2 /usr/lib/jvm/temurin-21-jdk-amd64/bin/java 2111 manual mode
Press <enter> to keep the current choice[*], or type selection number: ^C选择后回车。
https://www.isharkfly.com/t/eclipse-temurin-jdk-21-ubuntu/18670