title: JVM version manager
body: <p>Is there <a href="http://rvm.beginrescueend.com" rel="noreferrer">Ruby Version Manager</a> equivalent for the Java world?</p>
  
  <p>I'm looking for tool which allow me to easily download and install a new JVMs and switch between them. For example:</p>
  
  <pre><code>jvm install &lt;version&gt;
  jvm list //will list installed JVMs on my system
  jvm use jdk1.6 //will switch my env to jdk 1.6 version, etc.
  </code></pre>