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mouseEntered() doesn't catch the event

 
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Hi,
I am trying to implement mouseEntered and mouseExited methods. The mouseEntered method some times see some times doesn't see the mouse entered in the rectangular area. Here are the code for mouseEntered and mouseExited:
public void mouseEntered(MouseEvent e) {
Point p = e.getPoint();
if (r1.contains(p)) {
setR1 = true;
repaint();
}
}
public void mouseExited(MouseEvent e) {
Point p = e.getPoint();
if (r1.contains(p) && setR1) {
setR1 = false;
repaint();
}
}
r1 is a Rectagle object and setR1 is boolean.
Any ideas why the mouseEntered sometimes work, sometimes doesn't.
Thx.
Ulvi.
 
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