import javax.swing.JDialog;
import javax.swing.JOptionPane;
public class Main {
public static void main(String[] argv) throws Exception {
JOptionPane pane = new JOptionPane("your message",JOptionPane.ERROR_MESSAGE, JOptionPane.OK_OPTION);
JDialog d = pane.createDialog(null, "title");
d.pack();
d.setModal(false);
d.setVisible(true);
while (pane.getValue() == JOptionPane.UNINITIALIZED_VALUE) {
try {
Thread.sleep(100);
} catch (InterruptedException ie) {
}
}
System.exit(0);
}
}