Difference between addComponent() and getContent().addComponent()?

Is there a difference between addComponent(x) and getContent().addComponent(x)?

Example:

public class X extends Form
{
...
 public void doSomething()
 {
  setContent(new HorizontalLayout());
  addComponent(new Button("button 1"));
  getContent().addComponent(new Button("button 2"));
 }
}