How do I remove old Java version from Linux?

1. purge the older with sudo apt-get purge openjdk-*
2. Add repository sudo add-apt-repository ppa:openjdk-r/ppa.
3. Update the packages sudo apt-get update.
4. Install java 8 with sudo apt-get install openjdk-8-jdk.
5. To check list of java versions installed do sudo update-java-alternatives –list.

How do I change Java alternatives in Linux?

To set the Java version interactively:

1. Log in as root or use sudo .
2. View the Java alternatives. sudo update-alternatives –config java. …
3. Select a Java version, at the prompt, type a number. Press enter to keep the default[*], or type selection number: …
4. Verify the switch, check the Java version. java -version.