Can't add anymore components to one of my panel

Hi everyone,

This is my very first post and just wanna say to hi everyone first. I'm writing a GUI tic-tac-toe game for my skool assignment using MVC. It's a pain in the neck. I'm having a problem regarding to my game board creation. I've shown the code below. The board works fine but just next 2 the board, there are 2 buttons and 2 labels. New Game button followed by Undo button and followed by Message which shows who turn it's and the last component is to show Who win the game. The problem is I can't add anymore buttons in my "secondColumnPanel". I've attached the window which i'm trying to achieve. Please any suggestion would be very much appreciated. Thanks everyone.

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridLayout;

import java.awt.Label;
import java.awt.event.ActionListener;
import javax.swing.*;

public class DefaultBoard extends View
{
    private JButton button[]=new JButton[9],newGameButton,undoGameButton;
  
    private int buttonIndex=0;
    private JFrame defaultWindow;
    private JPanel secondColumnPanel,firstColumnPanel;
    private NewGame newGame;
    private Undo undoGame;
    public DefaultBoard(Controller defaultController)
    {
     
        defaultWindow=new JFrame("Tic-Tac-Toe");
        //define GridBagConstraint
       // GridBagConstraints constraint=new GridBagConstraints();

defaultWindow.setLayout(new GridLayout(0,2)); //setting default layout 0 rows 2 columns

firstColumnPanel=new JPanel(new GridLayout(3,0)); //where all the board (only play field buttons) button exist 
        secondColumnPanel=new JPanel(new GridLayout(4,10,30,30)); // where all the information exist (New game button, Undo button, 2 labels)

defaultWindow.add(firstColumnPanel); //add firstColumnPanel to the defaultWindow
        defaultWindow.add(secondColumnPanel); //add secondColumnPanel to the defaultWindow
        defaultWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //creation of 9 buttons and add all 9 buttons to the firstColumnPanel
        //and also add actionListeners to each buttons
        for(;buttonIndex<button.length;buttonIndex++)
        {
            button[buttonIndex]=new JButton();
            button[buttonIndex].setPreferredSize(new Dimension(100,100));
            button[buttonIndex].addActionListener((ActionListener) defaultController);
            firstColumnPanel.add(button[buttonIndex]);
        }
      
        //add NewGame view into defaultBoard
        newGame=new NewGame();
        newGameButton=newGame.getButton();

undoGame=new Undo();
        undoGameButton=undoGame.getButton();

secondColumnPanel.add(newGameButton);
        secondColumnPanel.add(undoGameButton);
  [b]      /* I can't add anymore items here I've no idea why */[/b]
       //secondColumnPanel.add(newGameButton);
       //.add(newGameButton);

//adding action to each buttons
       this.button[0].setActionCommand("buttonZero");
       this.button[1].setActionCommand("buttonOne");
       this.button[2].setActionCommand("buttonTwo");
       this.button[3].setActionCommand("buttonThree");
       this.button[4].setActionCommand("buttonFour");
       this.button[5].setActionCommand("buttonFive");
       this.button[6].setActionCommand("buttonSix");
       this.button[7].setActionCommand("buttonSeven");
       this.button[8].setActionCommand("buttonEight");

defaultWindow.setSize(400,400); //set the size of the window
        defaultWindow.setVisible(true); //make the window visible
    }

}

here's your code (stripped of unrelated stuff), which works OK (adding an extra 2 JLabels)
with the making of newGameButton and undoGameButton as new JButton()s (don't have access to NewGame() or Undo())

import java.awt.*;
import javax.swing.*;

class DefaultBoard
{
    private JButton button[]=new JButton[9],newGameButton,undoGameButton;
    private int buttonIndex=0;
    private JFrame defaultWindow;
    private JPanel secondColumnPanel,firstColumnPanel;

public DefaultBoard()
    {
        defaultWindow=new JFrame("Tic-Tac-Toe");
        defaultWindow.setLayout(new GridLayout(0,2));

firstColumnPanel=new JPanel(new GridLayout(3,0));
        secondColumnPanel=new JPanel(new GridLayout(4,10,30,30));

defaultWindow.add(firstColumnPanel);
        defaultWindow.add(secondColumnPanel);
        defaultWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

for(;buttonIndex<button.length;buttonIndex++)
        {
            button[buttonIndex]=new JButton(""+buttonIndex);
            button[buttonIndex].setPreferredSize(new Dimension(100,100));
            firstColumnPanel.add(button[buttonIndex]);
        }
        newGameButton=new JButton("New Game");
        undoGameButton=new JButton("Undo");
        secondColumnPanel.add(newGameButton);
        secondColumnPanel.add(undoGameButton);
        secondColumnPanel.add(new JLabel("OK 1"));
        secondColumnPanel.add(new JLabel("OK 2"));

defaultWindow.setSize(400,400);
        defaultWindow.setVisible(true);
    }
    public static void main(String[] args)
    {
      SwingUtilities.invokeLater(new Runnable(){
        public void run(){
          new DefaultBoard();
        }
      });
    }
}

perhaps the problem is related to the what is returned from newGame.getButton() and undoGame.getButton(), but it's only a wild guess

try changing newGameButton and undoGameButton as I did, and see if you can add extra components>

Thanks for the quick reply. Yeah, it works fine now.

I dunno what went wrong. I been trying to add 2 more components since this evening and those 2 just didn't show up.

. Sorry for being stupid again but I still have another question. How can i put some space between my first panel and second panel ?? It just doesn't look so good. Please help me out of this again and thz millions in advance.

> How can i put some space between my first panel and second panel ??

defaultWindow.setLayout(new GridLayout(0,2));

use the 3rd/4th parameters as you've done here
secondColumnPanel=new JPanel(new GridLayout(4,10,30,30));

Thanks a lot ! It solved