In the Linux environment, it is important to be able to check the version of Java installed on your system. This information is crucial for troubleshooting, compatibility, and ensuring that you have the necessary Java version for running specific applications or programs. By knowing the Java version, you can also determine if any updates or upgrades are required.

To check the Java version in Linux, you can use the "java -version" command in the terminal. This command displays the installed Java version along with additional information about the Java Runtime Environment (JRE) and Java Virtual Machine (JVM) installed on your system.

Example: Open the terminal in your Linux system and type the following command:

java -version

This will display the installed Java version information, such as:

openjdk version "11.0.12" 2021-07-20
OpenJDK Runtime Environment (build 11.0.12+7-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.12+7-Ubuntu-0ubuntu1.20.04, mixed mode, sharing)

In this example, the installed Java version is 11.0.12.