title: Cannot run "HelloWorld" on macintosh
body: <p>On Macintosh OS 10.7.5, I'm able to successfully compile the following code: </p>
  
  <pre><code>class HelloWorld {
      public static void man(String [] args) {
          system.out.println("Hello, world");
      }
  }
  </code></pre>
  
  <p>However, when i use the command "java HelloWorld," as my textbook instructs me to do, I am returned the following error: <code>"Could not find or load main class helloworld"</code>
  So, What's going on here? Obviously, I'm absolutely brand new to java, and to programming in general. </p>