How to Install Oracle JDK 11 on Ubuntu 18.04 Bionic LTS Easy Guide

Setting Up

4. 4. Setting Up Java

   Next to Set Up Oracle Java JDK 11
   You can directly Copy & Paste the Commands into Terminal..

   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-11/bin/java 1165

   update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-11/bin/javac 1165

   update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-11/bin/jar 1165

   update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk-11/bin/javaws 1165

   Checking or Setting the System Java Version in Use with

   update-alternatives --config java

   And for the Java Compiler instead:

   sudo update-alternatives --config javac

   To Switch of Java Version Just Enter the Selection Number on First, Column. :)

   

5. 5. Setting Up Env

   (Optional) Setting JAVA_HOME User Environment Variable.

   su [myUserName]

   Or simply:

   exit

   And Edit the Bash environment Configuration file

   nano $HOME/.bashrc

   Append:

   export JAVA_HOME=/usr/lib/jvm/jdk-11

   Possibly to Check the JDK 11 exact PATH use in another window:

   ls /usr/lib/jvm/

   Ctr+x to Save & Exit from nano Editor :)
   Next to Load the New Bash Environment:

   bash

6. Finally, Test New Java JDK 11 Installation.

   java -version