title: How do in-built methods do things?
body: <p>Just something that has been playing on my mind recently. A java example of what I mean by an inbuilt method: <code>System.out.println("hi");</code>. How does this method actually make 'hi' appear on screen? I can imagine a long series of methods inside methods inside methods, but how would the 'base' method do what it is supposed to?</p>