Java的JDialog弹窗关闭问题

Question

最近在学习Java的图形窗口制作，自己写了一个简易的Modbus报文自动生成的程序，但是这个JDialog弹窗一直不对，查资料思考了许久也找不出原因，烦请大家帮忙给指点一下！
JDialog的代码如下：

public static void Creat_JDialog()
    {
        jd.setTitle("警告");
        jd.setLayout(null);
        
        jd.setSize(250,150);
        jd.setLocationRelativeTo(jf);
        JLabel jl1=new JLabel(parameter_in[2]);
        jl1.setBounds(25,20,200,20);
        container2.add(jl1);
        JButton jb=new JButton("确认");
        jb.setBounds(95,60,60,20);
        jb.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e)
            {
                jl1.setText("");
                jf.setEnabled(true);
                jd.dispose();
            }
                });
        container2.add(jb);
        jd.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
        jd.setVisible(true);
    }

    调用该方法的代码如下：

if(parameter_in[2]=="false")
                {
                    jtf9.setText(parameter_in[0]);
                    jtf10.setText(parameter_in[1]);
                }
                else
                {
                    jf.setEnabled(false);
                    Image.Creat_JDialog();
                }

    想实现的效果就是当输入的时间没有越限时，自动生成对应的Modbus报文，当输入的时间越限时，弹窗提示越限的部分。
    第一次弹窗结果如下：

    第二次弹窗结果如下：

前两次弹窗都是正确的，但是从第三次开始，弹窗就成这样了：

第二次弹窗的内容在关闭弹窗时并没有被清除，后续每一次弹窗的内容在关闭时都没有被清除，我查了许多关于Java弹窗关闭的方法，都没能解决这个问题（不知道为什么“jl1.setText("");”这一行从第三次开始就好像没有被执行），还请大家帮忙给指条明路，万分感谢！

Answer 1

修改后的完整代码如下：

class Image {
    public static JFrame jf = new JFrame();
    public static Container container1 = jf.getContentPane();
    public static JDialog jd = new JDialog();
    public static Container container2 = jd.getContentPane();
    public static String[] parameter_out = new String[8];
    public static String[] parameter_in = new String[3];
    private static JLabel jl1 = new JLabel();

    public Image() {
        jd.setTitle("警告");
        jd.setLayout(null);

        jd.setSize(250, 150);
        jd.setLocationRelativeTo(jf);
//        JLabel jl1 = new JLabel();
        jl1.setBounds(25, 20, 200, 20);
        container2.add(jl1);
        JButton jb = new JButton("确认");
        jb.setBounds(95, 60, 60, 20);
        jb.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                jf.setEnabled(true);
                jd.setVisible(false);
            }
        });
        container2.add(jb);
        jd.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
    }

    //新建窗口容器
    public static void Creat_JFrame(String title) {
        Toolkit toolkit = Toolkit.getDefaultToolkit();
        Dimension dimension = toolkit.getScreenSize();
        int screen_width = dimension.width;
        int screen_height = dimension.height;
        jf.setTitle(title);
        int jf_width = 500;
        int jf_height = 300;
        jf.setLayout(null);
        jf.setBounds((screen_width - jf_width) / 2, (screen_height - jf_height) / 2, jf_width, jf_height);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    //新建弹窗容器
    public static void Creat_JDialog() {
        jl1.setText(parameter_in[2]);
        jd.setVisible(true);
    }

    //画面显示
    public void Image_Show() {
        Image.Creat_JFrame("报文生成器");

        JLabel jl1 = new JLabel("年");
        jl1.setBounds(60, 10, 20, 20);
        container1.add(jl1);
        JTextField jtf1 = new JTextField();
        jtf1.setBounds(30, 30, 80, 20);
        container1.add(jtf1);
        JLabel jl2 = new JLabel("月");
        jl2.setBounds(180, 10, 20, 20);
        container1.add(jl2);
        JTextField jtf2 = new JTextField();
        jtf2.setBounds(150, 30, 80, 20);
        container1.add(jtf2);
        JLabel jl3 = new JLabel("日");
        jl3.setBounds(300, 10, 20, 20);
        container1.add(jl3);
        JTextField jtf3 = new JTextField();
        jtf3.setBounds(270, 30, 80, 20);
        container1.add(jtf3);
        JLabel jl4 = new JLabel("时");
        jl4.setBounds(420, 10, 20, 20);
        container1.add(jl4);
        JTextField jtf4 = new JTextField();
        jtf4.setBounds(390, 30, 80, 20);
        container1.add(jtf4);
        JLabel jl5 = new JLabel("分");
        jl5.setBounds(60, 60, 20, 20);
        container1.add(jl5);
        JTextField jtf5 = new JTextField();
        jtf5.setBounds(30, 80, 80, 20);
        container1.add(jtf5);
        JLabel jl6 = new JLabel("秒");
        jl6.setBounds(180, 60, 20, 20);
        container1.add(jl6);
        JTextField jtf6 = new JTextField();
        jtf6.setBounds(150, 80, 80, 20);
        container1.add(jtf6);
        JLabel jl7 = new JLabel("毫秒");
        jl7.setBounds(295, 60, 30, 20);
        container1.add(jl7);
        JTextField jtf7 = new JTextField();
        jtf7.setBounds(270, 80, 80, 20);
        container1.add(jtf7);
        JLabel jl8 = new JLabel("转出地址");
        jl8.setBounds(405, 60, 50, 20);
        container1.add(jl8);
        JTextField jtf8 = new JTextField();
        jtf8.setBounds(390, 80, 80, 20);
        container1.add(jtf8);
        JLabel jl9 = new JLabel("输入的时间是：");
        jl9.setBounds(30, 130, 90, 20);
        container1.add(jl9);
        JTextField jtf9 = new JTextField();
        jtf9.setEditable(false);
        jtf9.setBounds(30, 150, 220, 20);
        container1.add(jtf9);
        JLabel jl10 = new JLabel("对应的报文是：");
        jl10.setBounds(30, 180, 90, 20);
        container1.add(jl10);
        JTextField jtf10 = new JTextField();
        jtf10.setEditable(false);
        jtf10.setBounds(30, 200, 440, 20);
        container1.add(jtf10);

        JButton jb = new JButton("生成");
        jb.setBounds(400, 110, 60, 20);
        jb.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                parameter_out[0] = jtf1.getText();
                parameter_out[1] = jtf2.getText();
                parameter_out[2] = jtf3.getText();
                parameter_out[3] = jtf4.getText();
                parameter_out[4] = jtf5.getText();
                parameter_out[5] = jtf6.getText();
                parameter_out[6] = jtf7.getText();
                parameter_out[7] = jtf8.getText();
                parameter_in = MODBUS_TimeSet.modbus_TimeSet(parameter_out);
                if (parameter_in[2] == "false") {
                    jtf9.setText(parameter_in[0]);
                    jtf10.setText(parameter_in[1]);
                } else {
                    jf.setEnabled(false);
                    Image.Creat_JDialog();
                }
            }
        });
        container1.add(jb);
        jf.setVisible(true);
    }
}

class MODBUS_TimeSet {
    public static String[] modbus_TimeSet(String[] middle_in) {
        int year_dec, month_dec, day_dec, hour_dec, minute_dec, second_dec, millisecond_dec;
        StringBuffer month_dec_show = new StringBuffer();
        StringBuffer day_dec_show = new StringBuffer();
        StringBuffer hour_dec_show = new StringBuffer();
        StringBuffer minute_dec_show = new StringBuffer();
        StringBuffer second_dec_show = new StringBuffer();
        StringBuffer millisecond_dec_show = new StringBuffer();
        StringBuffer addr = new StringBuffer();
        int[] month_day = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        String[] middle_out = new String[10];

        year_dec = Integer.parseInt(middle_in[0]);
        if ((year_dec <= 0) || (year_dec >= 65536)) {
            middle_out[2] = "年份输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        StringBuffer year_hex = new StringBuffer(Integer.toHexString(year_dec).toUpperCase());
        if (year_hex.length() % 2 != 0) {
            year_hex = year_hex.insert(0, "0");
        } else {
        }
        if (year_hex.length() != 4) {
            year_hex = year_hex.insert(0, "00");
        } else {
        }
        year_hex = year_hex.insert(2, " ");
        year_hex = year_hex.append(" ");
        //根据年份确定对应月份的日期，用于判断后面输入的日期是否越限
        if (((year_dec % 4 == 0) && (year_dec % 100 != 0)) || (year_dec % 400 == 0)) {
            month_day[1] = 29;
        } else {
        }
        month_dec = Integer.parseInt(middle_in[1]);
        if ((month_dec <= 0) || (month_dec >= 13)) {
            middle_out[2] = "月份输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        month_dec_show = month_dec_show.append(month_dec);
        if (month_dec_show.length() == 1) {
            month_dec_show = month_dec_show.insert(0, "0");
        } else {
        }
        StringBuffer month_hex = new StringBuffer(Integer.toHexString(month_dec).toUpperCase());
        month_hex = month_hex.insert(0, "0");
        month_hex = month_hex.append(" ");

        day_dec = Integer.parseInt(middle_in[2]);
        if ((day_dec <= 0) || day_dec > month_day[month_dec - 1]) {
            middle_out[2] = "日期输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        day_dec_show = day_dec_show.append(day_dec);
        if (day_dec_show.length() == 1) {
            day_dec_show = day_dec_show.insert(0, "0");
        } else {
        }
        StringBuffer day_hex = new StringBuffer(Integer.toHexString(day_dec).toUpperCase());
        if (day_hex.length() != 2) {
            day_hex = day_hex.insert(0, "0");
        } else {
        }
        day_hex = day_hex.append(" ");

        hour_dec = Integer.parseInt(middle_in[3]);
        if ((hour_dec < 0) || (hour_dec >= 24)) {
            middle_out[2] = "小时输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        hour_dec_show = hour_dec_show.append(hour_dec);
        if (hour_dec_show.length() == 1) {
            hour_dec_show = hour_dec_show.insert(0, "0");
        } else {
        }
        StringBuffer hour_hex = new StringBuffer(Integer.toHexString(hour_dec).toUpperCase());
        if (hour_hex.length() != 2) {
            hour_hex = hour_hex.insert(0, "0");
        } else {
        }
        hour_hex = hour_hex.append(" ");

        minute_dec = Integer.parseInt(middle_in[4]);
        if ((minute_dec < 0) || (minute_dec >= 60)) {
            middle_out[2] = "分钟输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        minute_dec_show = minute_dec_show.append(minute_dec);
        if (minute_dec_show.length() == 1) {
            minute_dec_show = minute_dec_show.insert(0, "0");
        } else {
        }
        StringBuffer minute_hex = new StringBuffer(Integer.toHexString(minute_dec).toUpperCase());
        if (minute_hex.length() != 2) {
            minute_hex = minute_hex.insert(0, "0");
        } else {
        }
        minute_hex = minute_hex.append(" ");

        second_dec = Integer.parseInt(middle_in[5]);
        if ((second_dec < 0) || (second_dec >= 60)) {
            middle_out[2] = "秒输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        second_dec_show = second_dec_show.append(second_dec);
        if (second_dec_show.length() == 1) {
            second_dec_show = second_dec_show.insert(0, "0");
        } else {
        }
        millisecond_dec = Integer.parseInt(middle_in[6]);
        if ((millisecond_dec < 0) || (millisecond_dec >= 1000)) {
            middle_out[8] = "毫秒输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        millisecond_dec_show = millisecond_dec_show.append(millisecond_dec);
        if (millisecond_dec_show.length() == 1) {
            millisecond_dec_show = millisecond_dec_show.insert(0, "00");
        } else if (millisecond_dec_show.length() == 2) {
            millisecond_dec_show = millisecond_dec_show.insert(0, "0");
        } else {
        }
        StringBuffer second_hex = new StringBuffer(Integer.toHexString(second_dec * 1000 + millisecond_dec).toUpperCase());
        if (second_hex.length() % 2 != 0) {
            second_hex = second_hex.insert(0, "0");
        } else {
        }
        if (second_hex.length() != 4) {
            second_hex = second_hex.insert(0, "00");
        } else {
        }
        second_hex = second_hex.insert(2, " ");

        if ((Integer.parseInt(middle_in[7], 16) <= 0) || (Integer.parseInt(middle_in[7], 16) >= 256)) {
            middle_out[9] = "转出地址输入越限，请重新输入!";
            return middle_out;
        } else {
        }
        addr = addr.append(middle_in[7].toUpperCase());
        if (addr.length() != 2) {
            addr = addr.insert(0, "0");
        } else {
        }
        addr = addr.append(" ");

        String middle_out_dec = new String(year_dec + "-" + month_dec_show + "-" + day_dec_show + "\t" + hour_dec_show + ":" + minute_dec_show + ":" + second_dec_show + ":" + millisecond_dec_show);
        String middle_out_hex = new String("00 C5 00 00 00 0F " + addr + "10 1F 40 00 04 08 " + year_hex + month_hex + day_hex + hour_hex + minute_hex + second_hex);
        middle_out[0] = middle_out_dec;
        middle_out[1] = middle_out_hex;
        middle_out[2] = "false";
        return middle_out;
    }
}

public class Main {
    public static void main(String[] args) {
        Image image = new Image();
        image.Image_Show();
    }
}

调试了很久，期待额外加个鸡腿