title: Switching between two java versions on Windows
body: <p>Currently I have a java project where I should support different version of it, which use different version of Java (and some tools, like Ant). Depends on issue tickets I need to handle both java version (7 and 8) and pretty often switch between them. 
  Can someone suggest the best way to handle it easier? I'm working on Windows 7, so I wrote such bat-file for switching ("switch_java.bat"):</p>
  
  <pre><code>@ECHO OFF
  set changeToNewVersion=%1
  
  IF "%changeToNewVersion%"=="true" (
      setx /M ANT_HOME "c:\Program Files\Ant\apache-ant-1.9.4"
      setx /M JAVA_HOME "c:\Program Files\Java\jdk1.8.0_51"
  ) ELSE IF "%changeToNewVersion%"=="false" (
      setx /M ANT_HOME "c:\Program Files\Ant\apache-ant-1.8.3"
      setx /M JAVA_HOME "c:\Program Files\Java\jdk1.7.0_79"
  ) ELSE (
      echo ERROR: Enter key!
  )
  </code></pre>
  
  <p>But maybe there is more optimal solution?</p>