jdk_switch.bat

REM https://blog.nediiii.com/jdk-windows-setup/
@echo off

:start
echo current JDK version:
java -version

echo.
echo =============================================
echo available JDK version:
echo OpenJDK-8
echo OpenJDK-11
echo =============================================

:select
set /p version=please choose JDK version ( 8 or 11 ):
if %version%==8 (
    echo "choose jdk 8"
)^
else if %version%==11 (
    echo "choose jdk 11"
)^
else (
    echo "illegal input, please re-enter;"
    goto select
)
echo =============================================

REM 为当前会话提供更新的环境变量,仅在当前会话生效
call SET Path=%%JAVA_HOME_%version%%%\bin;%Path%
call SET JAVA_HOME "%%%%JAVA_HOME_%version%%%%%"

REM 将新的环境变量写入用户变量中,将长期生效
call SETX JAVA_HOME "%%%%JAVA_HOME_%version%%%%%"

:end
@echo on