How to Install or Update Java on Windows 11 or Windows 10

To install Java on Windows 11, download the Windows installer for the Java version your application or course requires, run it, then open a new Command Prompt and enter java -version. For Java development, install a Java Development Kit (JDK) and also check javac -version. Set JAVA_HOME only when your development tools need it.

The steps below use Microsoft Build of OpenJDK for native Windows 11. A separate section covers applications that specifically require Oracle Java 8. Java installed inside Windows Subsystem for Linux does not configure Java for Windows applications.

Choose the Java Version Before Downloading

Start with the requirements supplied by your app, project, or instructor. A program that specifies Java 17 or 21 should receive that major version unless its documentation explicitly allows another. Installing a newer release is not a reliable substitute for checking compatibility.

• Writing or compiling Java programs: Choose a JDK. It supplies the runtime and development tools, including the javac compiler.
• Running an existing application: Follow its runtime requirements. Some applications include their own runtime, so check their installation instructions before adding a separate one.
• An app specifically asks for Java 8: Use its vendor-approved Java 8 distribution. The Java download at java.com serves Java 8; it is a different route from installing a current JDK.

For example, if a course requests JDK 21 and an unrelated desktop app requests Java 8, those are two requirements. Do not uninstall the app’s working runtime merely to simplify your developer setup.

Install a JDK With the Windows Installer

1. Check Your PC’s Architecture

Open Settings > System > About and look at System type. An x64-based processor uses the Windows x64 package; an ARM-based processor uses an ARM64/AArch64 package when the application supports it. Both are 64-bit, but they are different download choices. Our guide on how to tell if your computer is 32-bit or 64-bit in Windows 11 explains what each System type value means.

2. Download the Required JDK

Open the official Microsoft Build of OpenJDK downloads. Find the required major version, then select the Windows row, matching architecture, and exe installer. Microsoft provides versions including 25, 21, 17, and 11. Choose the current update within the required version.

Wait for the download to finish. A ZIP package requires manual extraction and configuration; choose the EXE for the graphical installation described here.

3. Run Setup and Note the Installation Folder

Close Java applications, open your Downloads folder, and double-click the installer. Review the publisher, any permission request, and the terms shown. Continue only if you agree; on a managed PC, contact your administrator if installation is restricted.

Follow the wizard and note the actual JDK folder. Keep the feature that adds Java tools to PATH enabled. Microsoft documents PATH setup as a default installer feature; JAVA_HOME is a separate optional feature. Finish setup before checking the commands.

Microsoft’s installation documentation advises using one installation method per JDK version. If that version is already installed through MSI or ZIP, review the documented migration instructions before switching methods. Do not stack installers to troubleshoot an unrelated application problem.

4. Verify Java and the Compiler

Close any existing terminal, search Start for Command Prompt, and open a fresh window. Run these separately:

java -version
javac -version

Both should display the major version you chose. The extra update numbers and vendor text can differ. If java works but javac does not, you may have a runtime without the compiler, or the terminal may be finding another installation. Use the troubleshooting checks below.

Install an Oracle JDK When Your Project Requires It

If your course or project specifically requires Oracle JDK, visit Oracle’s Java downloads, choose the required major version and its Windows installer for your supported architecture, and review its license and system requirements. Do not substitute the Java 8 runtime at java.com for a development kit. Wait for the download to finish, open the downloaded EXE, authorize the expected installer on a PC you administer, follow setup and note the actual JDK installation folder. Oracle’s Windows installation guide describes this installer route; the specific version and folder vary.

Open a new Command Prompt and check java -version and javac -version. Both should match the required major version. If a development tool needs JAVA_HOME, use the complete environment-variable procedure below with this Oracle JDK’s actual folder, not its bin subfolder. Preserve other PATH entries. Use where.exe java and where.exe javac to investigate an unexpected version, then check the IDE or project’s selected JDK. Installing a kit does not guarantee every application uses it.

Set JAVA_HOME When a Tool Requires It

JAVA_HOME identifies the JDK’s main folder; PATH tells Windows where to find commands. Setting one does not automatically correct the other. Before changing existing variables, copy their values so you can restore them.

1. Search Start for Edit the system environment variables, open it, and select Environment Variables. Our guide to opening environment variables in Windows 11 explains the user and system lists.
2. Under System variables, select New, or edit an existing JAVA_HOME. System changes may require administrator permission. Set the name to JAVA_HOME and the value to the actual JDK folder containing bin.
3. If PATH does not already point to this JDK’s bin folder, select Path > Edit > New and add %JAVA_HOME%\bin. Preserve unrelated entries.
4. Select OK in each dialog. Open a new Command Prompt, run echo %JAVA_HOME%, and repeat both version checks.

Do not append \bin to the JAVA_HOME value itself. Do not copy an example folder name without checking that it exists. Microsoft’s Windows Java setup guide documents this configuration.

If Your Application Requires Oracle Java 8

Use this route only when the application’s instructions call for it. Oracle lists Windows 11 support for its 64-bit Java 8 downloads from update 311 onward. On an ARM PC, confirm the application and runtime’s supported architecture with the vendor.

1. Follow Oracle’s Java 8 offline installation instructions to reach its manual download page. Select the Windows 64-bit offline download appropriate for the application.
2. Save the installer, close applications, and open the downloaded file. Administrator access is required.
3. Review the terms before selecting Install, and review any optional software choices. Complete setup and select Close.
4. Reopen the application and check whether it finds the required runtime. Restart Windows if the installer requests it.

This installs a runtime for that use case; it does not supply the JDK compiler. Follow the app’s own verification instructions instead of assuming a successful JDK command means that app is configured.

Install or Update an App’s Java Runtime on Windows 10

For a Windows 10 application that specifically requires Oracle Java 8, use the Oracle Java 8 installation section above. Oracle’s manual Windows installation guide covers Windows 10 and Windows 11: download the appropriate Windows offline installer, close Java applications, run setup, review its terms and optional choices, finish installation and reopen the application. Check its supported architecture rather than copying a Windows 11 or ARM download choice blindly. The java.com download is Java 8; it does not mean that you have installed the newest Java major version or a development compiler.

To update an existing installation, identify which Java version the app needs and which installation it actually uses. Download the current update within that required major version from its official provider and follow the matching installation method described above. For a JDK, also confirm that the chosen package supports your Windows version. Open a new Command Prompt, check where.exe java and java -version, and use javac -version when checking a JDK; then test the affected app. Review any old-version removal offer carefully. Oracle recommends removing obsolete Java versions, but also notes that apps can depend on a particular version. Arrange a compatible app update before removing a required runtime. An app with bundled Java may need its own vendor update, and installing Java does not enable obsolete browser applets in Chrome.

Fix Common Installation Problems

Java Is Not Recognized

First open a new terminal. In Command Prompt, run where.exe java. Microsoft’s where command documentation explains that it searches the current folder and PATH. If it finds nothing, confirm setup completed and the installed JDK’s bin folder is in PATH.

The Wrong Version Appears

Run where.exe java and where.exe javac to see the matching locations. Compare those folders with the JDK you intended to use. An earlier Java entry can take precedence; an IDE may also have its own configured JDK.

Oracle documents a JDK 25/Java 8 PATH conflict in which installing Java 8 afterward changes the version returned by the command. Identify the installation involved before repairing it. Repeatedly downloading newer versions will not establish which executable your app uses.

A Working Java Command Does Not Fix the App

Check the application’s required major version, architecture, and runtime location. A command-line check establishes that this terminal can run Java; it does not establish compatibility for every application. Use the app’s settings or vendor support instructions to select its runtime.

Frequently Asked Questions

Do I Need JAVA_HOME Just to Run Java?

Not for the basic java -version check if PATH is already correct. Development tools may require JAVA_HOME, so use their requirements.

Should I Remove Older Java Versions?

Check which applications depend on them first. Remove an installation through its normal Windows uninstall entry only after confirming it is no longer needed. If your changes cause a problem, restore the environment values you copied and reopen the affected application.

Is Java the Same as JavaScript?

No. Installing Java does not enable JavaScript in a web browser. This guide configures Java applications and development tools on Windows.

Once the required version passes the checks, reopen your application or development tool and confirm that it uses the intended installation.