Java 自定义spinnerdatemodel不执行任何操作

覆盖了getPrevious（）和getNext（）的自定义spinnerdatemodel没有执行任何操作。我做错了什么

这是我的密码。这在我看来是正确的；所以，是的，任何帮助都将不胜感激。谢谢

/**
 * Custom spinner model for the times (hhmm)
 */
class SpinnerTimeModel extends SpinnerDateModel {

    /**
     * Constructor
     */
    public SpinnerTimeModel() {
        cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        setValue(cal.getTime());
        setStart(cal.getTime());
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        setEnd(cal.getTime());
    }

    /**
     * Returns a time 30 minutes prior to the current time
     *
     * @return a time 30 minutes prior to the current time
     */
    @Override
    public Object getPreviousValue() {
        Calendar previous = Calendar.getInstance();
        previous.setTime(getDate());
        previous.add(Calendar.MINUTE, -30);
        return previous.getTime();
    }

    /**
     * Returns a time 30 minutes after the current time
     *
     * @return a time 30 minutes after the current time
     */
    @Override
    public Object getNextValue() {
        Calendar next = Calendar.getInstance();
        next.setTime(getDate());
        next.add(Calendar.MINUTE, 30);
        return next.getTime();
    }
    private Calendar cal;
}

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如果将JSpinner编辑器类型设置为DateEditor，那么现有代码将正常工作。代码已注释

public class spinnerdemo {
    public void show() {
        JFrame f = new JFrame("JSpinner Demo");
        f.setSize(500, 100);
        f.setLayout(new GridLayout(1, 1));
        JSpinner ctrlSpin = new JSpinner();
        ctrlSpin.addChangeListener(new javax.swing.event.ChangeListener() {
            @Override
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                System.out.println("" + ctrlSpin.getValue());
            }
        });
        ctrlSpin.setModel(new SpinnerTimeModel());
        //set the DateEditor
        ctrlSpin.setEditor(new JSpinner.DateEditor(ctrlSpin, "dd/MM/yyyy HH:mm:ss.SS"));
        f.add(ctrlSpin);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }
    public static void main(String[] args) {
        new spinnerdemo().show();
    }
}

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你怎么用这个？给点背景好吧，让我更具体一点。当我单击jspinner的上/下箭头时，编辑器的值不会改变。下面是我设置/添加微调器、编辑器等的代码：startTimeSpinner.setModel（new SpinnerTimeModel（））；setModel（新的SpinnerTimeModel（））；setEditor（新的JSpinner.DateEditor（startTimeSpinner，“HHmm”）；setEditor（新的JSpinner.DateEditor（endTimeSpinner，“HHmm”）；