Adding an outside int into an action listener

I have to do a very small project for school: making a game of tic tac toe in Java using JButtons and I have a short question.

Here's the code:

public void FensterAufbauen() {
    int i = 0;	
	myPanel.setLayout(null);
	myButton.setText("");
	myButton.setBounds(40,70,80,80);
	myButton.addActionListener(new ActionListener(){
		public void actionPerformed(ActionEvent arg0) {
			if (i % 2 == 0){
			myButton.setText("X");
			}
			else {
			myButton.setText("O");
			}
			i++;
		}
	});
}

Now how would I add the int i into the action listener
(I have this for all 9 buttons so I can't just define i inside the listener)?
I am sorry in advance if anything here seems sloppy - I'm pretty new to Java

i has to be final if you want to access it from within an anonymous inline class:

final int i = 0;

That, of course, will mean you can no longer change it. Thus, instead, declare i as a non-final, private variable in the surrounding class, rather than a local variable. Or you could also declare i as a private variable inside your ActionListener, just above the actionPerformed() function.