Centering JDialog In Relation To Parent JFrame

This code displays the JDialog (jd) in center of the JFrame (jf) object.

import javax.swing.*;
import java.awt.*;

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Point p = jf.getLocation();
jd.setLocation(p.x+(jf.getWidth()-jd.getWidth())/2, p.y+(jf.getHeight()-jd.getHeight())/2);
jd.setVisible(true);