How to Get Screensize

In many cases you wish your application to start in different places on the user's screen.
The following line does just that:

Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();

A nice use is putting a form in the middle of the screen:

setLocation(dim.width / 2 - this.getWidth() / 2, dim.height / 2 - this.getHeight() / 2);