windows 下JDK命令行下熱切版本

:Main
cls & set "jdk_version="


@echo off
set  JDK_1_6=C:\Program Files\Java\jdk1.6.0_43
set  JDK_1_7=C:\Program Files\Java\jdk1.7.0_79
set  JDK_1_8=C:\Program Files\Java\jdk1.8.0_112

color 0a
echo.------------------------------------
echo.TODO:設置java環境變量
 
echo -----------選擇JDK版本--------------
echo 一、1.6 
echo 二、1.7 
echo 三、1.8 

echo.------------------------------------
echo, & set /p jdk_version=請輸入編號並回車：
if "%jdk_version%"=="1" goto JDK_1_6_tag
if "%jdk_version%"=="2" goto JDK_1_7_tag
if "%jdk_version%"=="3" goto JDK_1_8_tag
:JDK_1_6_tag
set JAVA_HOME=%JDK_1_6%
goto SET_JAVA_VARIBLE
:JDK_1_7_tag
set JAVA_HOME=%JDK_1_7%
goto SET_JAVA_VARIBLE
:JDK_1_8_tag
set JAVA_HOME=%JDK_1_8%
goto SET_JAVA_VARIBLE

:SET_JAVA_VARIBLE
  
set classpath=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tool.jar;
set PATH=%JAVA_HOME%\bin;%PATH%

javac -version