Need help with GUI ContentPane's

[persianprez]

Hi guys, I am in desperate need of help. I'm not exactly sure how to fix this or how to pass contentpanes correctly. Here is my code for gameboard.java:

import javax.swing.*;

public class GameBoard implements ActionListener {

	private int[][] winSlots = new int[][] {
			{0, 1, 2}, {3, 4, 5}, {6, 7, 8}, //horizontal wins
			{0, 3, 6}, {1, 4, 7}, {2, 5, 8}, //virticle wins
			{0, 4, 8}, {2, 4, 6}			 //diagonal wins
	};
	private JFrame frame = new JFrame("Tic Tac Toe");
	private JButton buttons[] = new JButton[9];
	private int count = 0;
	private String player = "";
	private boolean win = false;
	public GameBoard(){
	
	frame.setSize(300,300);
	//frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.setLayout(new GridLayout(3,3));
	
	//much easier. <3 for loops
	for(int i=0; i<9; i++){
		buttons[i] = new JButton();
		frame.add(buttons[i]);
		buttons[i].addActionListener(this);
	}
	
	
	//frame.setVisible(true);
	}
	

	public void actionPerformed(ActionEvent act) {
		count++;
		
		
		if(count % 2 == 0){
			player = "O";
		} else {
			player = "X";
		}

		JButton pressedButton = (JButton)act.getSource(); 
		pressedButton.setText(player);
		pressedButton.setEnabled(false);
		
	
		for(int i=0; i<8; i++){
			if( buttons[winSlots[i][0]].getText().equals(buttons[winSlots[i][1]].getText()) && 
				buttons[winSlots[i][1]].getText().equals(buttons[winSlots[i][2]].getText()) && 
				buttons[winSlots[i][0]].getText() != ""){
				win = true;
			}
		}
		
		
		if(win == true){
			JOptionPane.showMessageDialog(null,player + " wins!");
			System.exit(0);
		} else if(count == 9 && win == false){
			JOptionPane.showMessageDialog(null,"Tie Game!");
			System.exit(0);
		}		
	}
	
	public Container getContentPane(){
		return frame.getContentPane();
	}
	
	//public static void main(String[] args){
		//GameBoard starter = new GameBoard();
	//}
}

Now this works perfectly on it's own without a driver class (commented out stand-a-lone parts), but once I edit it to make it work with the driver class, it won't work. The driver class is provided to me by my professor.

Driver Class:

import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import java.awt.event.*;

public class TicTacToeDriver {

	public static void main(String[] args) 
	{
		GameBoard b = new GameBoard ();             
                
	   JFrame frame = new JFrame (" Tic Tac Toe Board");
		
		frame.getContentPane().add(b);
		
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack ();
		frame.setVisible (true);
                     
	}
}

[JamesCherrill]

GameBoard b = new GameBoard ();
...
frame.getContentPane().add(b);

Apart from the anachronism of the getContentPane() - not needed for years now - the driver adds an instance of GameBoard to a JFrame. Check out JFrame's (or content pane's) add method - what kind of objects can you pass as the parameter to that method? To make this code legal your GameBoard class will have to be a subclass of one of those kinds of Objects.

This is a quite common pattern - create your custom GUI thing as a subclass of (say) JPanel so an application can just add it to a window that will contain other buttons, menus etc.