update java versions on macos or other computer. This script will switch java version at current env once.

update-java-version

#!/bin/zsh
# Author: Esonhugh
# Date: 2024/07/26

# Java is installed on mac with brew and IDEA
# following path is the IDEA path and brew path

# JAVA Alternatives
export COMMON_JAVA_HOME="$HOME/Library/Java/JavaVirtualMachines"

use_java_8 () {
    export JAVA_HOME="$COMMON_JAVA_HOME/azul-1.8.0_412/Contents/Home"
    export __OLD_JAVA_PATH=$PATH
    export PATH="${JAVA_HOME}/bin:$PATH"
}

use_java_11(){
    export JAVA_HOME="$COMMON_JAVA_HOME/azul-11.0.23/Contents/Home"
    export __OLD_JAVA_PATH=$PATH
    export PATH="${JAVA_HOME}/bin:$PATH"
}

use_java_18 () {
    export JAVA_HOME="$COMMON_JAVA_HOME/azul-18.0.2.1/Contents/Home"
    export __OLD_JAVA_PATH=$PATH
    export PATH="${JAVA_HOME}/bin:$PATH"
}

use_java_22 () {
    export JAVA_HOME="$COMMON_JAVA_HOME/openjdk-22.0.1/Contents/Home"
    export __OLD_JAVA_PATH=$PATH
    export PATH="${JAVA_HOME}/bin:$PATH"
}

use_java_unuse () {
    if [ -z "${__OLD_JAVA_PATH}" ]
    then
	export PATH=${__OLD_JAVA_PATH}
	unset __OLD_JAVA_PATH
    fi
}

function use_java () {
    if [ -z "$1" ]
    then
        if which "java" >/dev/null 2>&1 ; then
            echo "Detected java in your PATH"
        else
            echo "java is not installed in your PATH. Checkit out"
        fi
        echo "inspect current java version"
        echo "Java Binary is" `which java`
        echo "JAVA_HOME is '$JAVA_HOME'"
        echo "Execute java -version"
        java -version||java --version
        return 0
    fi
    if test "$1" = "8" -o "11" -o "18" -o "22" -o "unuse"
    then
        if which "use_java_$1" >/dev/null 2>&1 ; then
            echo "using java version $1"
            use_java_$1
        else
            echo "undefined java alias"
        fi
    else
        echo "undefined java version"
    fi
}

#use default java
use_java_8


# you can add other alias there.
alias update-java-version="use_java"
alias jvm="use_java" # java version manager.