用于true和false / MessageBox的Java布尔方法

Question

我正在尝试创建一个使用messageBox的方法，考虑到程序退出或按下“X”按钮的情况，询问是否记录更改并将其绑定以保存代码。如果没有更改，则不显示任何消息。

我明白我需要使用布尔值，但是我失败了。 其余部分将与结果相关联。

    package nbu.university.scheduler.messageBox;
import java.awt.EventQueue;

import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.AbstractAction;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.Timer;
public class ClosingFrame extends JFrame {
            /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public ClosingFrame() {

          addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                int showConfirmDialog = JOptionPane.
                        showConfirmDialog(ClosingFrame.this, "Do you want to save changes?");
                if (showConfirmDialog == JOptionPane.YES_OPTION) {

                    final JOptionPane optionPane = new JOptionPane("Has been save", JOptionPane.INFORMATION_MESSAGE, 
                          JOptionPane.DEFAULT_OPTION, null, new Object[]{}, null);
                    final JDialog dialog = new JDialog();
                    dialog.setTitle("Message");
                    dialog.setModal(true);
                    dialog.setContentPane(optionPane);
                    dialog.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
                    dialog.pack();          
                    //create timer to dispose of dialog after 1 seconds
                    Timer timer  = new Timer(1000, new AbstractAction() {
                        /**
                         * 
                         */
                        private static final long serialVersionUID = 1L;
                        @Override
                        public void actionPerformed(ActionEvent ae) {
                            dialog.dispose();
                        }
                    });
                  timer.setRepeats(false);//the timer should only go off once
                    //start timer to close JDialog as dialog modal we must start the timer before its visible
                    timer.start();
                     pack();
                    dialog.setVisible(true);
                                        System.out.println("saved");
                    System.exit(0);
                } else if (showConfirmDialog == JOptionPane.NO_OPTION) {
                    System.out.println("not saved");
                    System.exit(0);
                } else {
                    System.out.println("aborted");
                    // do nothing
                }
            }
        });

        setVisible(true);
    }
    public static void main(String[] args) {
         EventQueue.invokeLater((Runnable) new ClosingFrame());
    }
}

这是我正在尝试这样做的表中的代码

    private void exit()
    {
        this.dispose();
    }


    @Override
    protected void processWindowEvent(WindowEvent e)
    {

        if (e.getID() == WindowEvent.WINDOW_CLOSING)
        {
            exit();
        }
        else
        {
            super.processWindowEvent(e);
        }
    }

............................................... ................................

 public void getClassSchedulerModel(int classType, int classNumber)
    {
        if (classType == 0)
        {
            int count = bachelorClassesSchedulesHolder.getComponentCount();

            if (classNumber < count)
            {
                if (bachelorClassesSchedulesHolder.getComponent(classNumber) instanceof JTabbedPane)
                {
                    JTabbedPane component = (JTabbedPane)bachelorClassesSchedulesHolder.getComponent(classNumber);
                    rewriteTableRow(component);
                }
            }
        }

        if (classType == 1)
        {
            int count = masterClassesSchedulesHolder.getComponentCount();

            if (classNumber < count)
            {
                if (masterClassesSchedulesHolder.getComponent(classNumber) instanceof JTabbedPane)
                {
                    JTabbedPane component = (JTabbedPane)masterClassesSchedulesHolder.getComponent(classNumber);
                    rewriteTableRow(component);
                }
            }
        }
    }