Powershell Java Swapper

swap_java.ps1

# Create a list of java versions to pick from
$root_java = "C:\Program Files\Eclipse Adoptium" # This makes it easier to change the location of the java folder

$global:java_version_hashtable = [ordered]@{
    "8" = "jdk-8.0.312.7-hotspot"
    "11" = "jdk-11.0.13.8-hotspot"
    "16" = "jdk-16.0.2+7"
    "17" = "jdk-17.0.1.12-hotspot"
    "18" = "jdk-18.0.0.36-hotspot"
}

# Function that returns the path to the java version
# @param java_version - The java version to get the path for
# @return - The path to the java version
function java_version_path($java_version) {
    return $root_java + "\" + $java_version
}

foreach($item in $java_version_hashtable.GetEnumerator()) {
    # Get the position of the key in the hashtable
    $index = $($java_version_hashtable.keys).indexOf($item.Key)
    $java_path = java_version_path($item.Value)
    $message = "[{2}] Java {0}: {1}" -f $item.Key, $java_path, $($index + 1)
    Write-Output $message
}

# Write out the exit message
Write-Output "[X] Exit the script"

# Prompt the user for input
$selected = Read-Host "`nPlease select a java version"

# Check if the user selected X to exit
if ($selected -eq "X") {
    exit
}

if ([int]$selected -gt $java_version_hashtable.count) {
    Write-Output "[X] Invalid selection"
    exit
}

# Get the input'th item from the hashtable
$java_version = $($java_version_hashtable.keys)[$selected - 1]
$selected_java_path = java_version_path($java_version_hashtable[$java_version])

# Set the JAVA_HOME environment variable
$env:JAVA_HOME = $selected_java_path

# Reset the PATH variable
$env:PATH = "$env:JAVA_HOME\bin;$env:PATH"

$message =  "`nThe Java version has been set to Java {0}" -f $java_version
Write-Output $message