How to Check Version of Java in Ubuntu: A Comprehensive Guide


Java, a versatile and widely-used programming language, is an integral part of many applications and systems. If you’re using Ubuntu, a popular Linux distribution, you might be wondering how to check the version of Java installed on your system. In this guide, we’ll walk you through various methods to determine the Java version in Ubuntu. Whether you’re a beginner or an experienced user, this article has got you covered.

How to Check Version of Java in Ubuntu

Wondering how to find the Java version on your Ubuntu system? Here are several methods you can try:

1. Command Line Method:

The command line is a powerful tool for accessing system information, and checking the Java version is no exception. Open the terminal and type the following command:

ejava -version

Press Enter, and you’ll see detailed information about the installed Java version.

2. Using the javac Command:

Another way to check the Java version is by using the javac command, which is the Java compiler. Open the terminal and execute:

javac -version

This command will display the version of the Java compiler installed on your system.

3. Checking through System Settings:

Ubuntu provides a graphical interface for system settings. Click on the gear icon in the top right corner of the screen, then select “Settings.” In the settings window, click on “Details.” Here, you’ll find information about your system, including the Java version if it’s installed.

4. Using Synaptic Package Manager:

If you’ve used Synaptic Package Manager to install Java, you can find the version information there. Open Synaptic, search for “java” in the package list, and find the installed Java package. The version will be listed in the package details.

Exploring Different Java Versions:

Java has various editions and versions. Here are some insights into the different versions you might encounter:

Standard Edition (SE):

Java SE is the foundation for all Java platforms. It’s suitable for developing and running desktop, server, and embedded applications. Each SE version introduces new features and enhancements to the language and libraries.

Java Development Kit (JDK):

The JDK is a software package that includes the Java Runtime Environment (JRE), compiler, debugger, and other development tools. It’s essential for Java developers, as it provides everything needed to develop Java applications.

OpenJDK vs. Oracle JDK:

OpenJDK and Oracle JDK are two popular implementations of the Java Platform, Standard Edition. OpenJDK is open-source and widely used, while Oracle JDK was historically more feature-rich, but recent changes have brought the two implementations closer in terms of features.

Frequently Asked Questions (FAQs):

Is Java pre-installed on Ubuntu?

No, Java is not pre-installed on Ubuntu systems. You need to install it manually.

Can I have multiple Java versions on my Ubuntu system?

Yes, it’s possible to have multiple Java versions installed simultaneously. You can switch between them using the update-alternatives command.

How do I set the default Java version?

You can use the update-alternatives command to set the default Java version on your system.

Is it necessary to install Java to run Java applications?

Yes, you need Java installed on your system to run Java applications. The Java Runtime Environment (JRE) is required for executing Java programs.

What is the latest version of Java?

As of [current date], the latest version of Java is [latest version number]. Check the official Java website for updates.

Can I uninstall older Java versions?

Yes, you can uninstall older Java versions using package management tools like apt or dpkg.

How to check version of Java in Ubuntu?

Use the command java -version in the terminal.

How to check all JDK versions in Linux?

Run update-java-alternatives -l to see all installed JDK versions.

Which Java am I using on Linux?

Check the active Java version with java -version.

Which java Linux command?

Type java in the terminal to execute the command.

How do I check Java version in Linux?

Execute java -version in the terminal.

How to check the Java version in Ubuntu?

In the terminal, use java -version to view the Java version.

How to check the Java version on Linux?

Run java -version command in the terminal to check the Java version.


Knowing how to check the version of Java on your Ubuntu system is crucial for proper application development and compatibility. Whether you’re a Java developer or a user curious about the software on your system, the methods outlined in this guide should help you easily determine the Java version. Keep in mind the different Java editions and implementations available, and stay informed about the latest updates to ensure a seamless Java experience on Ubuntu.

Leave a comment