没有负值的 JSpinner

我正在 Netbeans 中构建一个小型应用程序，我使用 JSpinner 组件来设置产品的数量。如何将微调器设置为仅取正值？Netbeans 内是否有我可以设置的选择或方法JSpinner?

EXTRA:

spinner.setModel(new SpinnerNumberModel(0, 0, 20, 1));

for JSpinner http://download.oracle.com/javase/tutorial/uiswing/components/spinner.html你必须实施微调器编号模型 http://download.oracle.com/javase/6/docs/api/javax/swing/SpinnerModel.html

import javax.swing.*;

public class SpinnerModelTest {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                new SpinnerModelTest().makeUI();
            }
        });
    }

    public void makeUI() {
        SpinnerModel modeltau = new SpinnerNumberModel(0.0002, 0.0001, 100.0000, 0.0001);
        JSpinner spinner = new JSpinner(modeltau);
        ((JSpinner.NumberEditor) spinner.getEditor()).getFormat().setMaximumFractionDigits(4);
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(spinner);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}