How to make a TicTacToe game in Java?

My assignment requires me to make a java applet tic tac toe game. I have come as far as creating panels and adding 9 buttons to the center panel. The logic defeats me. I have looked around at the web for source code but everything looks fairly complicated. Here's what I have so far:
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Homework5 extends Applet {
Panel northPanel = new Panel();
Panel southPanel = new Panel();
Panel eastPanel = new Panel();
Panel westPanel = new Panel();
Panel mainPanel = new Panel();
Button resetButton = new Button ("Tic Tac Toe");
Button squares[];
public void init() {
setLayout(new BorderLayout());
northPanel.setBackground(Color.orange);
southPanel.setBackground(Color.orange);
eastPanel.setBackground(Color.orange);
westPanel.setBackground(Color.orange);
mainPanel.setBackground(Color.orange);
add("North", northPanel);
add("South", southPanel);
add("East", eastPanel);
add("West", westPanel);
add("Center", mainPanel);
resetButton.setFont(new Font("Arial", Font.PLAIN, 12));
northPanel.add(resetButton);
mainPanel.setLayout(new GridLayout(3,3));
squares = new Button[9];
for ( int i = 0; i < 9; i++ ) {
squares[i] = new Button();
//squares.addActionListener(this);
squares[i].setFont(new Font("Serif", Font.BOLD, 20));
mainPanel.add(squares[i]);
Can someone explain to me where I should go from here?
Thanks.

I figured it out. :-)
I had to use 2 arrays (one to create the button and another to hold the X's and O's in memory). I also had to call on the getSource method for the values in my array. This is where I was getting stuck initially. 3 hours and 2 mountain dews later, I was all warm and fuzzy when it compiled without an error. :-)
You can see it in action here:
http://www.vnoel.com/pcc/cs162/applets/knarayan/homework5.html

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