How to center JFrame on screen?

We many times need to center the JFrame on screen , to center the JFrame on screen we can use setLocationRelativeTo method by passing null as owner.
Following is the code to set the JFrame at center position , first we are creating the JFrame and then packing it and then calling setLocationRelativeTo( null ).

// create a new jframe, and pack it
JFrame frame = new JFrame("Center Frame");

//Set the frame size
frame.setSize( 500,400);

// centering the JFrame on screen


Note: We need to call pack before we call setLocationRelativeTo method , if we dont do it then JFrame wont able to collect the size we specify.
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