设置关闭jdialog时，某布尔值改变

在关闭 JDialog 时改变某布尔值的方法如下：

1. 在 JDialog 类中定义一个布尔类型的成员变量，例如：

public class MyDialog extends JDialog {
    private boolean isDialogClosed = false;
    // ...
}

2. 在 JDialog 的关闭事件监听器中设置该布尔值为 true，例如：

// 添加关闭事件监听器
addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosing(WindowEvent e) {
        isDialogClosed = true;
        dispose(); // 关闭对话框
    }
});

3. 在需要使用该布尔值的地方进行判断，例如：

MyDialog dialog = new MyDialog(parentFrame, "My Dialog", true);
dialog.setVisible(true);
if (dialog.isDialogClosed()) {
    // do something
}

完整的代码示例：

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class MyDialog extends JDialog {
    private boolean isDialogClosed = false;

    public MyDialog(JFrame parent, String title, boolean modal) {
        super(parent, title, modal);
        setSize(200, 100);
        setLocationRelativeTo(null);

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                isDialogClosed = true;
                dispose();
            }
        });
    }

    public boolean isDialogClosed() {
        return isDialogClosed;
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Main Window");
        frame.setSize(300, 200);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton button = new JButton("Open Dialog");
        button.addActionListener(e -> {
            MyDialog dialog = new MyDialog(frame, "My Dialog", true);
            dialog.setVisible(true);
            if (dialog.isDialogClosed()) {
                JOptionPane.showMessageDialog(frame, "Dialog is closed.");
            }
        });

        JPanel panel = new JPanel();
        panel.add(button);
        frame.add(panel);

        frame.setVisible(true);
    }
}