How to Check if You Have Java Installed

November 29, 2021

Introduction

Java runs many of the applications that we use daily. Many applications cannot run on older versions of Java. Hence, it is essential to know which version is installed on your system.

In this tutorial, learn how to check the Java version on your Mac or Windows system.

How to Check if Java is Installed and version on mac or windows

Prerequisites

A system running macOS or Windows
Access to the command-line/terminal window
A version of Java installed

Check Java Version on Mac

You can find the version of Java on macOS by:

using the GUI (Mac's System Preferences)
prompting for the version in the terminal window

Option 1: Check Java Version on Mac Using the GUI

To check the Java version on Mac without using the terminal by searching for the Java Control Panel in the System Preferences.

1. Click the Apple icon in the menu bar to open the drop-down menu and navigate to System Preferences.

2. A new window opens with various icons and settings. Find and click the Java icon to open the Java Control Panel.

Opening the Java control panel on Mac os

3. Once the Java Control Panel opens, click the About button. A new window with Java version information should appear.

Finding the Java version on macOS from the system preferences

Option 2: Check Java Version on Mac Using the Terminal

If you prefer using the terminal, checking the Java version is a simple one-command process.

1. First, open the terminal. To do so, click the Spotlight Search button in the top-right of the screen.

2. Type terminal in the search bar and open it by clicking on the icon in the search results.

3. Once in the command line, run the command: java -version . The output should display the Java version installed on your MacOS.

java version 1.8.0_261 installed on macOS

To check the version of the primary Java compiler – javac (pronounced "java-see") use the command:

          javac -version

Check Java Version on Windows

To check the Java version on a Windows computer, you can use:

the GUI (Windows Control Panel)
the command line

Option 1: Check Java Version on Windows Using GUI

To find the Java version on your Windows without opening a terminal window, use the Control Panel.

1. Open the Windows menu in the bottom-left corner and type control panel in the search bar.

Searching for the control panel in the Windows start menu.

2. Find the Control Panel in the search results and click the icon to open it.

3. Move to the Programs directory.

screenshot of the Open programs directory in Windows

4. Find and click the Java icon to open the Java Control Panel.

example of opening the Java Control Panel

5. Once the control panel opens, click the About button.

Viewing information about the Java control panel

6. The About Java window should appear and display the Java version on your computer.

example output of java version 8 update 261 installed on windows

Option 2: Check Java Version on Windows Using Command Line

Another option to find the Java version on Windows is through the command line.

1. Open the Windows Start menu in the bottom-left corner and type cmd in the search bar.

2. Then, open the Command Promptonce it appears in the search results.

3. A new window with the command prompt should appear. In it, type the command java -version and hit Enter. The output should display the Java version installed on your Windows system.

java version 1.8.0_261 installed on windows

You can also check the version of the Java's primary compiler, javac, with the command:

          javac -version

Conclusion

This article showed you how to check the version of Java installed on a macOS or Windows system.

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How to Check if You Have Java Installed

Source: https://phoenixnap.com/kb/check-java-version-on-mac-windows

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