防止swing对话框在外部单击/切换时自行关闭

import javax.swing.*;

public class ModalDialogExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Modal Dialog Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        frame.setLocationRelativeTo(null);

        JButton button = new JButton("Open Dialog");
        button.addActionListener(e -> {
            JDialog dialog = new JDialog(frame, "Modal Dialog", true);
            dialog.setSize(200, 100);
            dialog.setLocationRelativeTo(frame);
            dialog.setVisible(true);
        });

        frame.getContentPane().add(button);
        frame.setVisible(true);
    }
}