How to Switch Between Multiple Java Versions on Debian 9/8

This tutorial helps you to switch between multiple installed Java versions on a Debian system. For example, you have installed multiple Java versions on your Debian Linux system. Now you want to switch to other Java version as default Java.

Use update-alternatives command to set default Java version as following command:

sudo update-alternatives --config java

According to the above screenshot, I have selection option 2 which will set Oracle Java 8 as default Java version on your system. You can use java -version command to view default version.