java JDK switches 쉽게 할 수 있는 zsh shell function

.zshrc

# Switch to different Java version
jhome_usage() {
    echo "jhome - switch to different JDK version"
    echo "Usage: jhome [-h] [-v VERSION]"
    echo
    echo " -h     : display usage"
	echo " -v     : specific JDK version to switch"
    echo
    echo "Examples: "
    echo "># jhome -v 1.8 : switches to JDK8"
    echo "># jhome -v 11  : switches to JDK"
    echo "># jhome        : display all installed JDK and display current JDK"
}
jhome () {    
    if [ "$1" = "-h" ] ; then
        jhome_usage
    fi
    if [ "$#" -eq 0 ] ; then
        /usr/libexec/java_home -V
    fi

    if [ "$#" -eq 2 ] && [ "$1" = "-v" ] ; then
        export JAVA_HOME=`/usr/libexec/java_home $@`
        echo "Setting JAVA_HOME:" $JAVA_HOME
        echo 
        echo "Added JAVA_HOME/bin to PATH"
        PATH=$PATH:$JAVA_HOME/bin
        echo $PATH
        echo 
        java -version
    fi
}