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      (2) ÏÔʾConfirmDialog
JOptionPane.showConfirmDialog(null, "choose one", "choose one", JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {
setLabel("OK. Keep an eye on your wallet.");
} else if (n == JOptionPane.NO_OPTION) {
setLabel("Whew! Good choice.");
} else {
setLabel("It is your civic duty to cast your vote.");
}
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