Centering JFrame on desktop problem

Question

I have this code which centers JFrame on the desktop and which works fine only outside the constructor of the JFrame class. How can I make sure that the JFrame window is centered on the desktop when it opens?
GraphicsConfiguration gc = this.getGraphicsConfiguration();
Rectangle bounds = gc.getBounds();
int x = (int) ( bounds.getWidth() - this.getWidth() ) /2 ;
int y = (int) ( bounds.getHeight() - this.getHeight() ) /2;
this.setLocation( x, y );
The problem is that at "constructor time" the width and height are 0 (in this.getWidth and this.getHeight methods of JFrame).
any alternative to make it work?
thanks

Answer 1

I order to center the JFrame you can always get the screen size then simply set it's bounds e.g.
java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
Dimension scrSize = tk.getScreenSize();
Then depending on it's size determine the size you want the JFrame, and calculate the x, y co-ordinates. Making the size a fraction of the screen size, is easy to center e.g.
youJFrame.setBounds((int)(scrSize.getWidth()-(scrSize.getWidth()*.75)), (int)(scrSize.getHeight()-((int)scrSize.getHeight()*.75)),
(int)(scrSize.getWidth()*0.5), (int)(scrSize.getHeight()*0.5));