title: JSpinner without negative values
body: <p>I'm building a small application in netbeans,I use a JSpinner component to set the quantity of a product.How can I set the spinner to take only positive values?Is there a choice inside Netbeans that I can set or a method for the <code>JSpinner</code>?</p>
  <p><strong>EXTRA:</strong></p>
  <p><code>spinner.setModel(new SpinnerNumberModel(0, 0, 20, 1));</code></p>