title: Unable to run Java code with Intellij IDEA
body: <p>I have just downloaded the IDE, and I want to edit my first Java file with it, I'm not interested in creating a whole project, just editing the single file.</p>
  
  <p>So I opened the file from my desktop with Intellij IDEA as I set it as my default program for opening .java files.</p>
  
  <p>I write some code and the main run and debug buttons are greyed out! I can't run my code!</p>
  
  <p>I have already installed Java 8 update 45 64-bit (I have a 64 bit OS) as well as the Java development kit (J8U45). I have set my global IDE SDK as my JDK installation, and when it prompts me I also set this as my project SDK, but still the run and debug buttons are unable to be used!</p>
  
  <p>Edit: I am also unable to run my file regardless of if its in a project or not.</p>
  
  <p>Edit 2: Screenshot of my project setup
  <img src="https://i.stack.imgur.com/eltsa.png" alt="Project Setup"></p>