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As far as i know you can use every Java version when you are just in the right directory. Lets say i have on my PC Java 8 and Java 15. They are both located in C:\Program Files\java.
So when i go in C:\Program Files\java\jre1.8.0_291\bin and run in cmd java.exe -version i get the version 1.8 .
The same goes with Powershell.

But here comes the problem. When i go to C:\Program Files\java\jdk-15.0.1\bin i get in cmd the version 1.15, but in Powershell i still get 1.8.
I think that Powershell always refers to the standard JRE installed.

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    What does Get-Command java.exe resolve to (when you're inside the jdk-15* bin folder)? Commented May 12, 2021 at 15:46

2 Answers 2

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You need to add .\ before the command.

java.exe will run the first java in your PATH.
.\java.exe will run the java.exe in your current directory.

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Thaks for the Answer. Didnt know that PS is so close to the Linux terminal.
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you need .\ before the command to run the one in your current directory

personally, I use the below to switch versions, its a script that sets the JAVA home. This can be used when in any java dirs to use different versions

@echo off
set JAVA_HOME=C:\Program Files\Java\jdk-16
set Path=%JAVA_HOME%\bin;%Path%
echo Java 16 activated.

link to method I used below https://www.happycoders.eu/java/how-to-switch-multiple-java-versions-windows/

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Thanks for the script. I will use it in the future.

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