public void quit() {
super.quit();
display = null;
if (displayFrame != null) {
JFrame f = displayFrame;
displayFrame = null;
f.dispose();
}
}
// this method is called when the user close the java window
public void quit() {
super.quit();
// disposing the displayFrame automatically calls quit() on the display,
// so we don't need to do so ourselves here.
if (displayFrame != null) {
displayFrame.dispose();
displayFrame2.dispose();
}
// displayFrame = null; // let gc
// displayFrame2=null;
// display = null; // let gc
// display2=null;
}