Changing_Java_Version.md

1. sudo apt install openjdk-8-jdk

2. remove old symlik to /usr/bin/java -> old java location

sudo rm -rf /usr/bin/java

3. create new symlink to new java location

sudo ln -s /usr/lib/jvm/java-8-openjdk-amd64/ /usr/bin/java

4. add /usr/bin/java to $PATH in ~/.zshrc, it would have been removed when you deleted /usr/bin/java

5. source ~/.zshrc

6. sudo update-alternatives --config java select version