Switches java versions and add the new JAVA_HOME to the front of the PATH.

jvm.bat

@echo off

set VERSION=%1
call setEnvVar JAVA_HOME JAVA%VERSION%_HOME
echo JAVA_HOME=%JAVA_HOME%

setEnvVar.bat

@echo off

set WRITE=%1
set READ=%2

:main
	call :myset %WRITE% %%READ%%
	goto :end

:myset
	for /F "usebackq tokens=*" %%i in (`echo %%%2%%`) do set %1=%%i&& set PATH=%%i\bin;%PATH%
	goto :eof

:end
	set WRITE=
	set READ=