Switch between Java versions installed on Ubuntu Based Linux

select-java.sh

#!/usr/bin/env bash

set -euo pipefail

function main() {
    must_root
    sudo update-alternatives --config java
}

function must_root() {
    if [[ $EUID -ne 0 ]]; then
        echo "This script must be run as root." 
        exit 1
    fi
}

main $@