title: How do you show System.out and System.err in a UML Sequence Diagram?
body: <p>I'm drawing a UML Sequence Diagram for a <code>writeToFile()</code> method. In the method, the following calls are made:</p>
  
  <ul>
  <li>System.out.println()</li>
  <li>System.err.println()</li>
  <li>System.exit();</li>
  </ul>
  
  <p>I'm confused about how to represent this in the diagram. Do I draw three seperate rectangles: System.out, System.err and System respectively? </p>
  
  <p>Thanks for your help.</p>