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@echo off
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chcp 65001
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    rem --- Base Config ---
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    :init
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    set JAVA_HOME_1_8=C:\Program Files\Java\jdk1.8.0_131
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    set JAVA_HOME_1_7=C:\Program Files\Java\jdk1.7.0_25
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    set JAVA_HOME_1_6=C:\Program Files\Java\jdk1.6.0_43
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    :start
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    echo JDK 版本:
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    java -version
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    ping 127.0.0.1 -n 2 -w 1000 > nul
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    echo.
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    echo =============================================
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    echo jdk版本列表
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    echo 1.8
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    echo 1.7
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    echo 1.6
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    echo =============================================
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    :select
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    set /p opt=请选择jdk版本：
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    if %opt%==1.8 (
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     set TARGET_JAVA_HOME=%JAVA_HOME_1_8%
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    )
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    if %opt%==1.7 (
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     set TARGET_JAVA_HOME=%JAVA_HOME_1_7%
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    )
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    if %opt%==1.6 (
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     set TARGET_JAVA_HOME=%JAVA_HOME_1_6%
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    )
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    echo "当前选择的Java路径:%TARGET_JAVA_HOME%"
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    wmic ENVIRONMENT where "name='JAVA_HOME'" delete
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    wmic ENVIRONMENT create name="JAVA_HOME",username="<system>",VariableValue="%TARGET_JAVA_HOME%"
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    rem --- set path ---
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    set jhb=%TARGET_JAVA_HOME%\bin
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    set pt=%Path%
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    call set pt=%%pt:%jhb%;=%%
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    call set pt=%%pt:%jhb%=%%
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    wmic ENVIRONMENT where "name='Path' and username='<system>'" set VariableValue="%jhb%;%pt%"
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    rem -- refresh env ---
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    call RefreshEnv
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    echo 任意键退出...
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    pause>nul
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    chcp 936
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    @echo on