Java Runtime Environment is used to run Java applications. Java Runtime Environment is called JRE. There are different versions of JRE most recents major versions are 6,7,8 . Some of the applications generally requires different version because of comp ability problems. In this tutorial we will look how to get JRE or Java version from various operating systems.
If you want to learn JRE and differences with JDK please read following tutorial.
Java or JRE Version Numbers
Java uses a bit different version numbers. All java versions first numbers is
1 and actual major version numbers change according to release which is current
8 . Example Java version number is like below.
Determine JAVA Version in Windows From Command Line
We have different methods to determine Java or JRE version in windows. First way is running
java command in command like with version information. We will also provide
-version option like below.
> java -version
We can see that cırrent JRE or Java cersion is
1.8.0_144 . Here we can call
8 as major version number
Determine JAVA Version in Windows From GUI
We can use Java menu which resides in Control Panel.
And then In the
General tab click to
About button. This will open a new window which will provide information about current Java or JRE version.
Determine Java Version Linux (CentOS, RedHat, Fedora, Ubuntu, Debian, Kali, Mint)
We will use
java command from command line to get information about Java or JRE installation of Linux distributions.
$ java -version
Determine Java Version Online
There is also option to get Java version from online web site that runs applet and provides Java information. This applet can be accessed from following URL.