Step-by-step – How to Install Oracle JDK 6 on Ubuntu 20.04

Installing

3. 3. Extracting Oracle JDK 6

   Then Unpack the jdk6.bin Archive
   To make the Commands shorter Login as SuperUser with:

   sudo su

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo

   cd && cd Downloads

   To Check it’s there List the contents with:

   ls . | grep jdk

   The grep Command refine the output List showing only the Entries matching the Keyword.
   But if you are in Trouble to Find the Location on Terminal then See: How to Access Downloads Folder from Browser.
   Now to extract it run:

   ./jdk1.6*.bin

4. 4. Installing Oracle JDK 6

   So to Relocate JDK 6
   Play:

   mv ./jdk1.6.* /usr/lib/jvm/jdk1.6

   And if Not jvm Dir then first do:

   mkdir /usr/lib/jvm

   Now to Achieve the Setup use the update-alternatives Tool like:

   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.6.*/bin/java 1065

   update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.*/bin/javac 1065

   update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.6.*/bin/jar 1065

   update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.6.*/bin/javaws 1065

   Checking or Setting the System Java Version in Use with

   update-alternatives --config java

   And for the Java Compiler instead:

   update-alternatives --config javac

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

   Last, to Exit the SuperUser Login:

   exit

5. 5. Oracle JDK 6 Getting Started

   How to Getting-Started with Java 6

   Getting-Started Quickly with JDK6

   How to Getting-Started Quickly with Java JDK6 Development

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