SpinnerNumberModel具有短值

Question

我用这种方式用SpinnerNumberModel创建了JSpinner：

public class SpinnerFrameDoesntWork extends JFrame {
    public SpinnerFrameDoesntWork () {
        super("Spinner doesnt work");
        setSize(400, 200);
        init();
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);
        setLocationRelativeTo(null);
    }

    private void init() {
        final SpinnerNumberModel countSpinnerModel = new SpinnerNumberModel();
        final JSpinner countSpinner = new JSpinner(countSpinnerModel);
        countSpinnerModel.setValue((short)6);
        countSpinnerModel.setMinimum((short)6);
        countSpinnerModel.setMaximum((short)12);
        countSpinnerModel.setStepSize((short)1);
        add(countSpinner);
    }
}

我注意到，尽管微调器显示正确，但它不允许更改它的值，它是堆叠在＆＃34; 6＆＃34;

在排除故障时，我注意到，以下这两项工作正常：

用int而不是短裤：

public class SpinnerDoesWork1 extends JFrame {
    public SpinnerDoesWork1 () {
        super("Spinner does work 1");
        setSize(400, 200);
        init();
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);
        setLocationRelativeTo(null);
    }

    private void init() {
        final SpinnerNumberModel countSpinnerModel = new SpinnerNumberModel();
        final JSpinner countSpinner = new JSpinner(countSpinnerModel);
        countSpinnerModel.setValue(6);
        countSpinnerModel.setMinimum(6);
        countSpinnerModel.setMaximum(12);
        countSpinnerModel.setStepSize(1);
        add(countSpinner);
    }
}

更改对象初始化顺序：

public class SpinnerDoesWork2 extends JFrame {
    public SpinnerDoesWork2 () {
        super("Spinner does work 2");
        setSize(400, 200);
        init();
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);
        setLocationRelativeTo(null);
    }

    private void init() {
        final SpinnerNumberModel countSpinnerModel = new SpinnerNumberModel();
        countSpinnerModel.setValue((short)6);
        countSpinnerModel.setMinimum((short)6);
        countSpinnerModel.setMaximum((short)12);
        countSpinnerModel.setStepSize((short)1);
        final JSpinner countSpinner = new JSpinner(countSpinnerModel);
        add(countSpinner);
    }
}

我设法让它发挥作用，但我不知道第一个例子有什么问题？为什么它也不能正常工作？

感谢您的帮助！