Java

Basics

Version

java -XshowSettings:properties -version

JDK

From deb

sudo apt install ./Downloads/jdk-11.0.1_linux-x64_bin.deb

Through apt-get

sudo apt-get update
sudo apt-get install default-jdk

Location

Likely location of the JDK:

/usr/lib/jvm

IDE

Bundled IDEs on Ubuntu:

sudo apt install ubuntu-make

Or, for IntelliJ:

sudo add-apt-repository ppa:mmk2410/intellij-idea-community
sudo apt-get update
sudo apt-get install intellij-idea-community