From the official Oracle manual.

Navigate to /Library/Java/JavaVirtualMachines and remove the directory whose name matches the following format:

/Library/Java/JavaVirtualMachines/jdkmajor.minor.macro[_update].jdk

For example, to uninstall 8u6:

%rm -rf jdk1.8.0_06.jdk

Do not attempt to uninstall Java by removing the Java tools from /usr/bin. This directory is part of the system software and any changes will be reset by Apple the next time you perform an update of the OS.

To remove system files you need to add sudo before rm -rf command.

I was able to unistall jdk 8 in mavericks successfully doing the following steps:

Run this command to just remove the JDK

sudo rm -rf /Library/Java/JavaVirtualMachines/jdk<version>.jdk

Run these commands if you want to remove plugins

sudo rm -rf /Library/PreferencePanes/JavaControlPanel.prefPane
sudo rm -rf /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -rf /Library/LaunchAgents/com.oracle.java.Java-Updater.plist
sudo rm -rf /Library/PrivilegedHelperTools/com.oracle.java.JavaUpdateHelper
sudo rm -rf /Library/LaunchDaemons/com.oracle.java.Helper-Tool.plist
sudo rm -rf /Library/Preferences/com.oracle.java.Helper-Tool.plist

To uninstall AdoptOpenJDK installed via Homebrew,

brew uninstall adoptopenjdk8

To uninstall OpenJDK installed via Homebrew,

brew uninstall openjdk8

You can get official oracle instruction to remove java from macOS here

In your macOS terminal type this one by one

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

After that you can navigate to specific version of java that you intend to delete by using the following command:

Copycd /Library/Java/JavaVirtualMachines

Then type ls in your terminal to list down all the Java Virtual Machine Folders.
Finally add the version number you want to delete like this

sudo rm -rf jdk-10.0.1.jdk

Instead of jdk-10.0.1.jdk you can give any version number which are listed down in your above mentioned folder.

I solved this issue by installing java version manager as suggested by Dave in the comments and it worked! For those having the same issue, I followed this guide https://sma.im/how-to-manage-multiple-java-versions-on-macos/ up to /usr/libexec/java_home -V Then I did /Library/Java/JavaVirtualMachines/ then ls and corretto-11.0.17 showed up and I was able to remove it using rm -rf corretto-11.0.17

Oh, I just figured it out :) Just go to your Library -> Java -> JavaVirtualMachines and there it will be the JDK and openJDK folders, just move the openJDK folder to the trash and it will go back to the original JDK, when you type in your terminal java -version you’ll see.

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