jdk安装
sudo apt update
sudo apt install openjdk-8-jdk
https://linuxize.com/post/install-java-on-ubuntu-18-04/
Intellij idea 安装
https://www.xiaomiqiu.com/article/77
marven安装
https://linux265.com/news/3465.html
https://www.cnblogs.com/FengZeng666/p/11992420.html