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    <p>As was pointed out three times so far, this is exactly what <code>DocumentFilter</code>s are made for. Here is a <a href="http://sscce.org/" rel="nofollow">SSCCE</a> that does what you want:</p> <pre><code>import javax.swing.JFrame; import javax.swing.SwingUtilities; import javax.swing.JTextField; import javax.swing.text.AbstractDocument; import javax.swing.text.Document; import javax.swing.text.DocumentFilter; import javax.swing.text.BadLocationException; import javax.swing.text.AttributeSet; public class TestDocumentFilter extends JFrame { JTextField basePriceTF; public TestDocumentFilter() { super("TestDocumentFilter"); basePriceTF = new JTextField(); AbstractDocument basePriceDocument = (AbstractDocument) basePriceTF.getDocument(); basePriceDocument.setDocumentFilter(new PositiveIntegerFilter()); getContentPane().add(basePriceTF); } /** * Resets the document to "0" for input values that do not constitut a non-negative integer. */ private static class PositiveIntegerFilter extends DocumentFilter { @Override public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String inputTextValue, AttributeSet attrs) throws BadLocationException { Document oldDoc = fb.getDocument(); String textValue = oldDoc.getText(0, oldDoc.getLength()) + inputTextValue; Integer basePrice = 0; try { basePrice = Integer.parseInt(textValue); } catch (NumberFormatException e) { basePrice = 0; } if (basePrice &lt; 0) basePrice = 0; fb.replace(0, oldDoc.getLength(), basePrice.toString(), attrs); } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { JFrame frame = new TestDocumentFilter(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); } }); } } </code></pre> <p>You cannot enter "-1"; the field is reset to "0" when "-" is typed. Note the <code>FilterBypass</code> which avoids any recursive call.</p>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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