are you asking about changing the titlebar
text or changing the titlebar
font?
as your follow-on questions are along the same lines, i'm thinking you are asking about Look and Feel stuff ... maybe?
places to look might be
1) custom LAF
In the LAF/LNF, you can change
java gui component default properties like this ... but you would need to write and install a custom LAF ...
xtreme example might be
napkin laf 2) java internal properties
as i understand it, there is also some level of control available by overriding java default laf properties ... though i haven't tried it... it's probably the sort of thing you would only want to do as a last resort since you can't really guess how user might override/install laf's themselves OR how laf resources might chg in fut versions...
3) custom components
you can write button subclasses using your own icons for buttons and or checkboxes (some basic checkbox behaviors are button-derived).
the custom window title would be a little trickier, because you might need to do something like simulate a titlebar at the top of an undecorated window
hth...