JSpinner ActionListener alternative

Question

In my program, I want to use a JSpinner for a number. This number will later be used to calculate something. Every time the user clicks one of the spinner buttons (up or down), I want the result to update automatically. Since you can't add an ActionListener to a JSpinner (which I think is really weird), I am asking here how to do something similar to this (I already have an ActionListener ready for this, which can be changed in any other listener of course).

Answer 1

You could add a ChangeListener to the spinner. This will be triggered by the button presses (or a direct edit of the field).

spinner.addChangeListener(new ChangeListener() {      
  @Override
  public void stateChanged(ChangeEvent e) {
    // handle click
  }
});

Answer 2

Every time the user clicks one of the spinner button (up or down), I want the result to update automatically.

Add a DocumentListener to the Document of the text field that is being used as the editor of the spinner.

Edit:

JSpinner.DefaultEditor editor = (JSpinner.DefaultEditor)number.getEditor();
JTextField textField = editor.getTextField();
textField.getDocument().addDocumentListener( new DocumentListener()
{
    public void insertUpdate(DocumentEvent e)
    {
        System.out.println("insert");
    }

    public void removeUpdate(DocumentEvent e)
    {
        System.out.println("remove");
    }

    public void changedUpdate(DocumentEvent e) {}
});