i tried the method u told me,adwin.but mine codes can't seems to work.
my codes is not totally same as your example codes,in fact i still
use the setUndecorated(true) and i include the windowfocuslistener in
my jframe constructor.i read from other forums that i can't use pure
java to disable alt+tab,i have to use JNI.anyone know of any relevant
websites on this or any books,