Bagaimanakah Saya Boleh Mencegah Nilai Negatif atau Sifar dalam Sel JTable?

<code class="java">private static class PositiveIntegerCellEditor extends DefaultCellEditor {

    private static final Border red = new LineBorder(Color.red);
    private static final Border black = new LineBorder(Color.black);
    private JTextField textField;

    public PositiveIntegerCellEditor(JTextField textField) {
        super(textField);
        this.textField = textField;
        textField.setHorizontalAlignment(JTextField.RIGHT); // Align right for positive numbers
    }

    @Override
    public boolean stopCellEditing() {
        try {
            int value = Integer.valueOf(textField.getText());
            if (value < 0) {
                throw new NumberFormatException();
            }
        } catch (NumberFormatException e) {
            textField.setBorder(red); // Highlight invalid input
            return false;
        }
        textField.setBorder(black); // Reset border for valid input
        return super.stopCellEditing();
    }
}</code>

<code class="java">JTextField integerField = new JTextField();
PositiveIntegerCellEditor integerEditor = new PositiveIntegerCellEditor(integerField);
table.getColumnModel().getColumn(columnIndex).setCellEditor(integerEditor);</code>