title: JDK 11 Install Issue
body: <p>So i was trying to start Java, and download JDK 11. Also updated the JRE to the latest version. After installation and compiling my first "hello world" to "<em>xxx.class</em>", trying to run it with:</p>
  
  <pre><code>java xxx
  </code></pre>
  
  <p>turned up an error of incompatible versions (the compiled file was v.55 while the JRE version only interpreted files up to version 52.)</p>
  
  <p>So i unistalled JDK 11 and installed JDK 8. Now in my Java folder there is both a JDK.version_xxx and a JRE.version_xxx file, whereas when i installed JDK 11 there wasn't a JRE file installed (which i think was stated in the changes that happened in the new JDK 11 version). </p>
  
  <p>Where and what JRE do i need to get to run files compiled with JDK 11?</p>