Как поменять версию java

Switch JDK version in Windows 10 cmd

Is there a way to change JDK version easily in cmd? like the version on mac. Change Default JDK on Mac.

asked Nov 24, 2017 at 8:37
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7 Answers 7

Here’s my guide for Windows 10.

Step 1. Go to System Properties. Click on Environment Variables

Step 2. Add new variables, such as JAVA_8_HOME

• JAVA_8_HOME : %ProgramFiles%\Java\jdk1.8.0_152\bin
• JAVA_9_HOME : %ProgramFiles%\Java\jdk-9.0.1\bin
• JAVA_HOME : %JAVA_8_HOME%

In my case, JAVA_8_HOME (JDK8) is pointing to C:\Program Files\Java\jdk1.8.0_152\bin . You can replace this with your own path to javac . %JAVA_HOME% has a default value pointing to JAVA_8_HOME , which is the path for JDK8. That’s my preference, feel free to adjust accordingly.

Step 3. Select PATH and click on Edit . PATH

Step 4. Click on New and add %JAVA_HOME%. %JAVA_HOME% will be added to PATH automatically every time you launch a command prompt.

In order to switch JDK version in cmd, here’s the trick. Step 5. I created a batch file with

@echo off :: Switch JDK version DOSKEY java8=SET PATH=%JAVA_8_HOME%;%PATH%; DOSKEY java9=SET PATH=%JAVA_9_HOME%;%PATH% 

Basically, it disables echo and creates two alias. In batch file any string after :: is the comments. Every time, java8 or java9 is called, it re-exports %PATH% with the new JDK path. Save it as profile.bat . You can name it whatever you want.

Step 6. Search for regedit (Registry Editor). Click on Edit > New > String Value . Give AutoRun as the Value name and %USERPROFILE%\profile.bat as the Value data . Here, please put your actual path value to the profile.bat we just created. So, whenever a command prompt is opened, it automatically loads profile.bat , which creates those two alias in the script.

Step 7. Close any command prompt you’re using or just open a new command prompt. This is because your changes will not affect opened cmd window. Environment changes only happens to new CMD.

Step 8. Verify your results here.

If you’re using different Python versions, same trick applies, too. Find my python environment settings here.

Как поменять версию java

I suggest you unpack the scripts to C:\Program Files\Java\scripts .

The scripts look like this:

@echo off call javaX "Java 20" %1Code language: DOS .bat (dos)

javaX "Java 20" $args[0] Code language: PowerShell (powershell)

@echo off if %1 = hljs-number">1.2" set JAVA_HOME=C:\Program Files (x86)\Java\jdk1.2.2 if %1 = hljs-number">1.3" set JAVA_HOME=C:\Program Files (x86)\Java\jdk1.3.1_28 . if %1 = hljs-number">20" set JAVA_HOME=C:\Program Files\Java\jdk-20 if %1 = hljs-number">21" set JAVA_HOME=C:\Program Files\Java\jdk-21 if "%~2" == "perm" ( setx JAVA_HOME "%JAVA_HOME%" /M ) set Path=%JAVA_HOME%\bin;%Path% echo %~1 activated.Code language: DOS .bat (dos)

param ($javaVersion, $perm) switch ($javaVersion) < "Java 1.2" < $env:JAVA_HOME = "C:\Program Files (x86)\Java\jdk1.2.2" > "Java 1.3" < $env:JAVA_HOME = "C:\Program Files (x86)\Java\jdk1.3.1_28" > . "Java 20" < $env:JAVA_HOME = "C:\Program Files\Java\jdk-20" > "Java 21" < $env:JAVA_HOME = "C:\Program Files\Java\jdk-21" > > if ($perm -eq "perm") < [Environment]::SetEnvironmentVariable("JAVA_HOME", $env:JAVA_HOME, [System.EnvironmentVariableTarget]::Machine) > $env:Path = $env:JAVA_HOME + '\bin;' + $env:Path Write-Output "$javaVersion activated." Code language: PowerShell (powershell)

In the files javaX.bat and javaX.ps1 , you probably have to adjust some paths to the installed Java versions.

The scripts update the JAVA_HOME environment variable and insert the bin directory at the beginning of the Path variable. That makes it the first directory to be searched for the corresponding executable when you run Java commands such as java or javac .

(The Path variable gets longer with each change. Do not worry about it. This only affects the currently opened command line.)

Step 4: Add the Script Directory to the Path

To be able to call the scripts from anywhere, you have to add the directory to the «Path» environment variable (just like you did with «%JAVA_HOME%\bin» in the second step):

If you have installed the latest releases of all Java versions, you can use the scripts without any further adjustments. Open a new command line or PowerShell and enter, for instance, the following commands:

If one of the commands does not activate the expected Java version, please check if the path in the javaX.bat and javaX.ps1 files corresponds to the installation path of the Java version you want to activate.

Temporary and Permanent Java Version Changes

The commands presented up to this point only affect the currently opened command line or PowerShell. As soon as you open another command line, the default version defined in step 2 is active again (Java 20, if you have not changed anything).

If you want to change the Java version permanently, just add the parameter «perm» to the corresponding command, e.g.

Attention: To set the Java version permanently, you must open the command line or PowerShell as an administrator. Otherwise, you will get the error message «ERROR: Access to the registry path is denied.

What You Should Do Next…

I hope you were able to follow the instructions well and that the commands work for you.

Now I would like to hear from you:

Were you able to follow the steps well – or do you have unanswered questions?

Either way, let me know by leaving a comment below.

How to Change Java Version on Windows 10 Command Prompt

Changing the Java version on Windows 10 Command Prompt can be a useful skill for Java developers and enthusiasts. Whether you need to switch to a different version for compatibility reasons or simply want to experiment with different Java versions, knowing how to change the Java version on Command Prompt can come in handy. This blog post will guide you through the process, providing detailed instructions and insights to help you successfully change Java versions on Windows 10.

Video Tutorial:

The Challenge of Changing Java Version on Windows 10 Command Prompt

Many new Java developers may struggle with changing the Java version on Command Prompt for the first time. The Command Prompt is a powerful tool that allows users to execute commands and interact with their computer’s operating system. However, understanding how to navigate and manipulate the Command Prompt to switch Java versions can be confusing.

Things You Should Prepare for

Before you begin changing the Java version on Windows 10 Command Prompt, there are a few things you should prepare: 1. Ensure that you have multiple Java versions installed on your Windows 10 computer. If you have only one version of Java installed, you may need to download and install additional versions from the official Java website. 2. Familiarize yourself with the Command Prompt interface. Understanding basic Command Prompt commands and navigation will make the process of changing Java versions easier. 3. Make note of the location of each Java installation on your computer. You will need this information when specifying the Java version in Command Prompt commands. Now that you are prepared, let’s explore four different methods to change the Java version on Windows 10 Command Prompt.

Method 1. Changing Java Version Using “java” Command

To change the Java version using the «java» command, follow these steps: 1. Open Command Prompt by pressing the Windows key + R, typing «cmd,» and hitting Enter. 2. Type «java -version» in the Command Prompt and press Enter to check the currently installed Java version. 3. Locate the desired Java version’s installation directory on your computer. 4. In Command Prompt, type the following command to change the Java version:
«`
set PATH=«C:\path\to\desired\java\version\bin«;%PATH%
«`
Replace «C:\path\to\desired\java\version\bin» with the actual path to the desired Java version’s installation directory. 5. Now, type «java -version» again to verify that the Java version has been successfully changed. Pros:
1. Quick and straightforward method
2. Does not require modifying environment variables
3. Can be easily reversed by closing the Command Prompt window Cons:
1. Only temporary change for the current Command Prompt session
2. Not suitable for permanently setting the Java version

>java -version java version "1.8.0_66" Java(TM) SE Runtime Environment (build 1.8.0_66-b18) Java HotSpot(TM) 64-Bit Server VM (build 25.66-b18, mixed mode) 

PATH=C:\ProgramData\Oracle\Java\javapath; . C:\Program Files\Java\jdk1.6.0_45\bin