title: For a method like fillOval what does 'x' and 'y' denote ? What coordinates are they?
body: <p>For a method of <code>Graphics</code> class: <a href="http://docs.oracle.com/javase/6/docs/api/java/awt/Graphics.html#fillOval%28int,%20int,%20int,%20int%29" rel="nofollow">fillOval</a>, what does <code>x</code> and <code>y</code> denote ? The documentation says:</p>
  
  <pre><code>x - the x coordinate of the upper left corner of the oval to be filled.
  y - the y coordinate of the upper left corner of the oval to be filled.
  </code></pre>
  
  <p>I do not understand this. What does it mean ?</p>