在 JDatePicker 中手动输入

手动输入日期时出错

线程“AWT-EventQueue-0”中的异常 java.lang.ClassCastException：java.util.Date 无法转换为 java.util.Calendar

如何改进代码以便手动输入和使用下拉日历成为可能？

public class WordWorker {
    public static void main(String[] args) {
        Locale locale=new Locale("ru","RU");
        JFrame frame=new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(300,300);
        UtilDateModel model=new UtilDateModel();
        Properties p=new Properties();
        p.put("text.today","Today");
        p.put("text.month","Month");
        p.put("text.year","Year");
        JDatePanelImpl datePanel=new JDatePanelImpl(model,p);
        JDatePickerImpl datePicker=new JDatePickerImpl(datePanel,new DateLabelFormatter());
        datePicker.setTextEditable(true);

        frame.add(datePicker,"Center");
        JButton jButton=new JButton("Кнопка");
        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println(datePicker.getModel().getDay());
                System.out.println(datePicker.getModel().getMonth()+1);
                System.out.println(datePicker.getModel().getYear());
                System.out.println(datePicker.getModel().getValue());
            }
        });
        frame.add(jButton,"South");
        frame.setVisible(true);


    }
    private static class DateLabelFormatter extends JFormattedTextField.AbstractFormatter
    {
        private String datePattern="dd.MM.yyyy";
        private SimpleDateFormat dateFormatter=new SimpleDateFormat(datePattern);

        @Override
        public Object stringToValue(String text) throws ParseException {
            return dateFormatter.parseObject(text);
        }

        @Override
        public String valueToString(Object value) throws ParseException {
            if (value!=null)
            {
                Calendar cal= (Calendar) value;
                return dateFormatter.format(cal.getTime());
            }
            return "";
        }
    }
}