JSpinner没有负值

Question

我正在netbeans中构建一个小应用程序,我使用JSpinner组件来设置产品的数量.如何设置微调器只取正值？我可以在Netbeans中选择我可以设置的方法或方法JSpinner？

额外:

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

Answer 1

对于JSpinner,您必须实现SpinnerNumberModel

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);
    }
}

Answer 2

您是否尝试设置最小值？

http://docs.oracle.com/javase/7/docs/api/javax/swing/SpinnerNumberModel.html#setMinimum(java.lang.Comparable)