Is there any way to accept only numeric values in a JTextField?

Question

Is there any way to accept only numeric values in a JTextField? Is there any special method for this?

Answer 1

Concidering the number of views this question is getting, i found none of the above solution suitable for my problem. I decided to make a custom PlainDocument to fit my needs. This solution also makes a beep sound when the maximum number of characters used is reached, or the inserted text is not an integer.

private class FixedSizeNumberDocument extends PlainDocument
{
    private JTextComponent owner;
    private int fixedSize;

    public FixedSizeNumberDocument(JTextComponent owner, int fixedSize)
    {
        this.owner = owner;
        this.fixedSize = fixedSize;
    }

    @Override
    public void insertString(int offs, String str, AttributeSet a)
            throws BadLocationException
    {
        if (getLength() + str.length() > fixedSize) {
            str = str.substring(0, fixedSize - getLength());
            this.owner.getToolkit().beep();
        }

        try {
            Integer.parseInt(str);
        } catch (NumberFormatException e) {
            // inserted text is not a number
            this.owner.getToolkit().beep();
            return;
        }

        super.insertString(offs, str, a);
    }               
}

implented as follows:

    JTextField textfield = new JTextField();
    textfield.setDocument(new FixedSizeNumberDocument(textfield,5));