Use update-alternatives command to set default Java version as following:
According to the above screenshot, Java 10 is now set as default Java version on your system. You can use java -version command to view default version.
![How to Switch Between Multiple Java Versions on Ubuntu TecAdmin - 34](https://tecadmin.net/wp-content/uploads/2018/10/switch-java-version-ubuntu.png)
Use update-alternatives command to set default Java version as following:
According to the above screenshot, Java 10 is now set as default Java version on your system. You can use java -version command to view default version.