How to Install Oracle JDK 12 on Zorin OS GNU/Linux

Oracle JDK 12 Zorin OS - Setting Up

4. 4. Setting Up Oracle JDK 12

   Now to Install JDK 12 into System

   sudo update-alternatives --install 
   /usr/bin/java java /usr/lib/jvm/jdk-12/bin/java 1065

   sudo update-alternatives --install 
   /usr/bin/javac javac /usr/lib/jvm/jdk-12/bin/javac 1065

   sudo update-alternatives --install 
   /usr/bin/jar jar /usr/lib/jvm/jdk-12/bin/jar 1065

5. 5. Switching to Java 12

   Finally, to Switch Java to JDK 12
   This is Valid only if you have to Manage more than One Java Releases:

   sudo update-alternatives --config java

sudo update-alternatives --config javac