Step-by-step – Oracle JDK 16 Installation in Ubuntu 20.04

Installing

2. 2. Downloading Oracle JDK 16

   Download Oracle JDK 16 GNU/Linux Package

   Here Oracle JDK 16 .deb 64-bit

   Link to Download Oracle JDK 16 for deb Based

3. 3. Installing Oracle JDK 16

   Then to Setup Oracle JDK 16 on Ubuntu 20.04 Linux
   First, Access the Target, usually in the Downloads folder:
   (But if downloaded with Firefox it can be instead into /tmp/mozilla*)

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   cd && cd Downloads

   Now to Confirm the Package is there do:

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   ls . | grep jdk

   But if you are in Trouble to Find the Location on Terminal then See: How to Access Downloads Folder from Browser.

   Finally, to Install JDK 16 simply:

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   sudo dpkg -i jdk-16*.deb

4. 4. Setting Up Java

   Next to Set Up Oracle Java JDK 16
   You can directly Copy & Paste the Commands into Terminal..

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   sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-16*/bin/java 1165

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   sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-16*/bin/javac 1165

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   sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-16*/bin/jar 1165

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   sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk-16*/bin/javaws 1165

   Checking or Setting the System Java Version in Use with

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   sudo update-alternatives --config java

   And for the Java Compiler instead:

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   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
   And Edit the Bash environment Configuration file

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   nano $HOME/.bashrc

   Append:

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   export JAVA_HOME=/usr/lib/jvm/jdk-16[Release]

   Replace [Release] with the actual one on the above Command.
   Possibly to Check the JDK 16 exact PATH use in another window:

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   ls /usr/lib/jvm/

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

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   bash

6. Finally, Test New Java JDK 16 Installation

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   java -version