How to center a JFrame object on the screen?

Does somebody know how to center a JFrame object on the screen. Please write an example because I'm new with java.
Thank you.

//this will set the size of the frame
frame.setSize(frameWidth,frameHeigth);
//get screen size
Toolkit kit=Toolkit.getDefaultToolkit();
//calculate location for frame
int x=(kit.getScreenSize().width/2)-(frameWidth/2);
int y=(kit.getScreenSize().height/2)-(frameHeigth/2);
//set location of frame at center of screen
frame.setLocation(x,y);

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How to center a JFrame object on the screen?

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