Preventing negative values in jSpinner

Question

I am using netbeans to build gui application in java. It has a jSpinner. I set its minimum value to 0. When i run and click on the down arrow button, i am getting, negativearraysizeexception. Any solution to this?

//This code is autogenerated in netbeans

protected void fireStateChanged() {
    Object[] listeners = listenerList.getListenerList();
    for (int i = listeners.length - 2; i >= 0; i -= 2) {
        if (listeners[i] == ChangeListener.class) {
            if (changeEvent == null) {
                changeEvent = new ChangeEvent(this);
            }
            ((ChangeListener)listeners[i+1]).stateChanged(changeEvent);
        }
    }
}

Answer 1

Try this way instead of that NetBeans autogenerated code:

import javax.swing.JFrame;
import javax.swing.JSpinner;
import javax.swing.SpinnerModel;
import javax.swing.SpinnerNumberModel;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class Spinner {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("Spinner demo");
               //10 is init value, 0 is minimum, 20 maximum and 1 is step
                SpinnerModel model = new SpinnerNumberModel(10, 0, 20, 1);
                JSpinner spinner = new JSpinner(model);
                spinner.addChangeListener(new ChangeListener() {
                    public void stateChanged(ChangeEvent e) {
                        JSpinner s = (JSpinner)e.getSource();
                        int val = (int)s.getValue();
                        System.out.println(val);
                    }
                });

                frame.add(spinner);
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

It returns proper values. No negative. Good luck!

Answer 2

it's a bit late, but here is a solution in Netbeans with auto generated code: jSpinner -> properties -> second row "model" click [..] and u have different options :)