title: how does javafx main method launch(args) work?
body: <p>The methods outside the main method are not mentioned in main method.
  The main method only contain <code>launch(args);</code></p>
  
  <p>I thought it need to call the methods outside the method that make it work in the program?</p>
  
  <p>So how does <code>launch(args)</code> work?</p>