The default button size in Windows is 75x23 pixels.
Swing ignores this; for example, the "OK" button in a
JOptionPane is 39x27 pixels big, and in the JFileChooser
dialogue, both the "OK" and the "Cancel" button are
73x27 pixels big.

N/A

From an initial look at the code, it looks as if the button sizes in OptionPane and FileChooser are somewhat arbitrary (based on label size, font, standard borders, etc).  We should probably modify the algoritms to more closely match those on windows so the buttons look more in proportion and aspect-ratio to the windows native buttons.

  xxxxx@xxxxx   2003-01-22

An easy way to see this, is to put a button next to a 
jtextfield. The button is higher on the Classic Theme  (XP) or 
on Win2000. Running the same code on f.i. the Silver Theme 
(XP) , you see that this is a lot better. This really makes an 
application ugly and unacceptable for someone who has an 
eye for GUI.

It is not only the buttons in OptionPane or FileChooser. All 
the buttons are too high compared to the Windows buttons 
(i'm comparing on a win 2000 machine.) On XP, there is only a 
problem with the classis theme!
It seems that the margins on the button are just too high

The fix must still take into account the font size though.
The font and font size may be changed in various ways,
and may not be the same as the system defaults (for
example, our application has a "scale all fonts" feature).