Making a Form appear on the center on the screen

Hi
How can i make a form in java to appear at the center of the screen no matter what the resolution of the scrren is .
Thanks

I know of 2 ways:
1. [The clean way]
http://forum.java.sun.com/thread.jsp?forum=57&thread=537866 EvilEdna's post {most thorough}
OR
http://forum.java.sun.com/thread.jsp?forum=31&thread=552229 My post (reply #1) {less thorough but still good}
2. [The dirty way]
frame.setLocationRelativeTo(null); {dirty!}

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first i use winXP sp3, database 10g ,developer suite 10g
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host('c/'||prepname||'.pdf',no_screen);
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end if;
end;
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regards
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Dear All,
thanks for your attention
really i modify my code to be appear as follow
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Making a Form appear on the center on the screen

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