Swith java version in PowerShell. Saving the script and Appending '. "C:\Path\To\Your\Script\switch-java.ps1"' to "$PROFILE" file

swith-java.ps1

function Switch-Java {
    param (
        [string]$Version
    )

    # The location of multi-version java
    $javaPaths = @{
        "8"  = "C:\Programs\dev\java\java"
        "11" = "C:\Programs\dev\java\java11"
        "17" = "C:\Programs\dev\java\java17"
    }

    # check input
    if (-not $javaPaths.ContainsKey($Version)) {
        Write-Host "Invalid Java version. Available versions: 8, 11, 17"
        return
    }

    # new java home
    $javaHome = $javaPaths[$Version]

    # set java home
    [System.Environment]::SetEnvironmentVariable("JAVA_HOME", $javaHome, [System.EnvironmentVariableTarget]::Process)

    # old path
    $currentPath = [System.Environment]::GetEnvironmentVariable("PATH", [System.EnvironmentVariableTarget]::Process)

    # remove outdated java path
    $newPath = ($currentPath -split ';' | Where-Object { 
        $javaPaths.Values -notcontains $_ -and $javaPaths.Values -notcontains ($_ -replace '\\bin$', '')
    }) -join ';'

    # new path
    $newPath = "$javaHome\bin;$newPath"

    [System.Environment]::SetEnvironmentVariable("PATH", $newPath, [System.EnvironmentVariableTarget]::Process)

    # classpath
    $classPath = ".;$($javaHome)\lib"
    [System.Environment]::SetEnvironmentVariable("CLASSPATH", $classPath, [System.EnvironmentVariableTarget]::Process)

    # print result JAVA_HOME\PATH\CLASSPATH
    Write-Host "JAVA_HOME set to: $javaHome"
    Write-Host "PATH updated to include: $javaHome\bin"
    Write-Host "CLASSPATH set to: $classPath"
	
    Write-Host ""

    # java now
    java -version
}

# alias
Set-Alias -Name sj -Value Switch-Java