am creating a calculator using net beans IDE so yeah i made 0 - 9 buttons.. although seems like i dont want to create an event handler on each number cause it's like a waste of time.. is it possible that the zero to nine button can only trigger one event?

if it is possible, can you show me how?? annndd also I would like to know which number triggered the button

Yes, just create an inner class that implements ActionListener. Then in the actionPerformed( ActionEvent e ) method you can call e.getSource() to find the button that was pressed and act accordingly. Then just add a single instance of your inner class to each button.

Hope this helps

doesn't even have to be an inner class

inner classes are nice because they can implicitly access the fields of the enclosing instance, so if your buttons were pointed to by a field, then you can use an inner class to access them

they're also a problem in that they prevent decoupling of responsibilities.

When they are short they're fine, but go to top level classes when they get longer than a few lines.