SwingUtilities: getWindowAncestor(Component c)
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Main {
public static void main(String[] a) {
JPanel panel = new JPanel();
JDialog dialog = new JDialog((JFrame) SwingUtilities.getWindowAncestor(panel), true);
}
}
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