Once you have opened the Terminal, enter one of the following Java commands in order to check it’s version: $ java -version You can open the Terminal application either through the Ubuntu Dash or the Ctrl+Alt+T shortcut. We will be using the Ubuntu command line, the Terminal, in order to run all the mentioned commands. We have run the commands and procedures mentioned in this article on a Ubuntu 18.04 LTS system. This article describes how you can easily check your installed Java version on your Ubuntu system. Time and again, a regular Ubuntu user might need to verify if Java is installed on the system at the moment and also if it is installed, which version is the system currently using. It does not come by default with most Ubuntu versions as security is a concern when Java is installed on your system. Certain applications in Ubuntu require that Java Runtime Library is installed on your system.
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