Steps I performed were from here : https://www.java.com/en/download/help/mac_uninstall_java.html

1. In the Terminal window Copy, Paste and run the commands below (one by one) :

   sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
   sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane
   sudo rm -fr ~/Library/Application\ Support/Oracle/Java
   
   

2. Then after successfully uninstalling Java, you may remove Java Deployment cache: In the Terminal window Copy and Paste the commands below:

   rm -r ~/"Library/Application Support/Oracle/Java"
   

3. then remove the jdk folder and it's content:

   sudo rm -r -f /Library/Java/JavaVirtualMachines/jdk<"your_version">.jdk
   

4. then perform the holy computer restart .

If you have more than 1 java version installed you may also find useful the info from this page: https://java.tutorials24x7.com/blog/how-to-switch-java-version-on-mac

1. Remove all the Java related packages (Sun, Oracle, OpenJDK, IcedTea plugins, GIJ):

   dpkg-query -W -f='${binary:Package}\n' | grep -E -e '^(ia32-)?(sun|oracle)-java' -e '^openjdk-' -e '^icedtea' -e '^(default|gcj)-j(re|dk)' -e '^gcj-(.*)-j(re|dk)' -e '^java-common' | xargs sudo apt-get -y remove
   sudo apt-get -y autoremove
   

2. Purge config files (careful. This command removed libsgutils2-2 and virtualbox config files too):

   dpkg -l | grep ^rc | awk '{print($2)}' | xargs sudo apt-get -y purge
   

3. Remove Java config and cache directory:

   sudo bash -c 'ls -d /home/*/.java' | xargs sudo rm -rf
   

4. Remove manually installed JVMs:

   sudo rm -rf /usr/lib/jvm/*
   

5. Remove Java entries, if there is still any, from the alternatives:

   for g in ControlPanel java java_vm javaws jcontrol jexec keytool mozilla-javaplugin.so orbd pack200 policytool rmid rmiregistry servertool tnameserv unpack200 appletviewer apt extcheck HtmlConverter idlj jar jarsigner javac javadoc javah javap jconsole jdb jhat jinfo jmap jps jrunscript jsadebugd jstack jstat jstatd native2ascii rmic schemagen serialver wsgen wsimport xjc xulrunner-1.9-javaplugin.so; do sudo update-alternatives --remove-all $g; done
   

6. Search for possible remaining Java directories:

   sudo updatedb
   sudo locate -b '\pack200'
   

   If the command above produces any output like /path/to/jre1.6.0_34/bin/pack200 remove the directory that is parent of bin, like this: sudo rm -rf /path/to/jre1.6.0_34.

To uninstall AdoptOpenJDK installed via Homebrew,

brew uninstall adoptopenjdk8

To uninstall OpenJDK installed via Homebrew,

brew uninstall openjdk8