title: JButtons not showing up on JPanel on JFrame
body: <p>Im trying to display 9 3x3 grids in a 3x3 grid. None of the buttons are showing up though. I had to create all the individual buttons and i didnt know if they took up to much space of if there is an obvious error in my code. Thanks for any input!   </p>
  
  <pre><code> public class BoardGui extends JFrame{
      private JPanel center;
      private JPanel grid00;
      private JPanel grid01;
      private JPanel grid02;
      private JPanel grid10;
      private JPanel grid11;
      private JPanel grid12;
      private JPanel grid20;
      private JPanel grid21;
      private JPanel grid22;
  
  
  
      private JButton sq0000,sq0100,sq0200,sq1000,sq1100,
          sq1200,sq2000,sq2100,sq2200;
          private JButton sq0001,sq0101,sq0201,sq1001,sq1101,sq1201,sq2001
          ,sq2101,sq2201;
          private JButton sq0002,sq0102,sq0202,sq1002,sq1102,sq1202
          ,sq2002,sq2102,sq2202;
          private JButton sq0010,sq0110,sq0210,sq1010,sq1110,sq1210,
          sq2010,sq2110,sq2210;
          private JButton sq0011,sq0111,sq0211,sq1011,sq1111,
          sq1211,sq2011,sq2111,sq2211;
          private JButton sq0012,sq0112,sq0212,sq1012,sq1112,sq1212,
          sq2012,sq2112,sq2212;
          private JButton sq0020,sq0120,sq0220,sq1020,sq1120,sq1220,
          sq2020,sq2120,sq2220;
          private JButton sq0021,sq0121,sq0221,sq1021,sq1121,
          sq1221,sq2021,sq2121,sq2221;
          private JButton sq0022,sq0122,sq0222,sq1022,sq1122,sq1222,
          sq2022,sq2122,sq2222;
  
          public void Board(){
  
              setLayout(new BorderLayout());
  
              center.setLayout(new GridLayout(3,3));
  
              grid00 = new JPanel();
              grid01 = new JPanel();
              grid02 = new JPanel();
              grid10 = new JPanel();
              grid11 = new JPanel();
              grid12 = new JPanel();
              grid20 = new JPanel();
              grid21 = new JPanel();
              grid22 = new JPanel();
  
              grid00.setLayout(new GridLayout(3,3));
              grid01.setLayout(new GridLayout(3,3));
              grid02.setLayout(new GridLayout(3,3));
              grid10.setLayout(new GridLayout(3,3));
              grid11.setLayout(new GridLayout(3,3));
              grid12.setLayout(new GridLayout(3,3));
              grid20.setLayout(new GridLayout(3,3));
              grid21.setLayout(new GridLayout(3,3));
              grid22.setLayout(new GridLayout(3,3));
  
              sq0000 = new JButton();
              sq0001 = new JButton();
              sq0002 = new JButton();
              sq0010 = new JButton();
              sq0011 = new JButton();
              sq0012 = new JButton();
              sq0020 = new JButton();
              sq0021 = new JButton();
              sq0022 = new JButton();
  
              sq0100 = new JButton();
              sq0101 = new JButton();
              sq0102 = new JButton();
              sq0110 = new JButton();
              sq0111 = new JButton();
              sq0112 = new JButton();
              sq0120 = new JButton();
              sq0121 = new JButton();
              sq0122 = new JButton();
  
              sq0200 = new JButton();
              sq0201 = new JButton();
              sq0202 = new JButton();
              sq0210 = new JButton();
              sq0211 = new JButton();
              sq0212 = new JButton();
              sq0220 = new JButton();
              sq0221 = new JButton();
              sq0222 = new JButton();
  
              sq1000 = new JButton();
              sq1001 = new JButton();
              sq1002 = new JButton();
              sq1010 = new JButton();
              sq1011 = new JButton();
              sq1012 = new JButton();
              sq1020 = new JButton();
              sq1021 = new JButton();
              sq1022 = new JButton();
  
              sq1100 = new JButton();
              sq1101 = new JButton();
              sq1102 = new JButton();
              sq1110 = new JButton();
              sq1111 = new JButton();
              sq1112 = new JButton();
              sq1120 = new JButton();
              sq1121 = new JButton();
              sq1122 = new JButton();
  
              sq1200 = new JButton();
              sq1201 = new JButton();
              sq1202 = new JButton();
              sq1210 = new JButton();
              sq1211 = new JButton();
              sq1212 = new JButton();
              sq1220 = new JButton();
              sq1221 = new JButton();
              sq1222 = new JButton();
  
              sq2000 = new JButton();
              sq2001 = new JButton();
              sq2002 = new JButton();
              sq2010 = new JButton();
              sq2011 = new JButton();
              sq2012 = new JButton();
              sq2020 = new JButton();
              sq2021 = new JButton();
              sq2022 = new JButton();
  
              sq2100 = new JButton();
              sq2101 = new JButton();
              sq2102 = new JButton();
              sq2110 = new JButton();
              sq2111 = new JButton();
              sq2112 = new JButton();
              sq2120 = new JButton();
              sq2121 = new JButton();
              sq2122 = new JButton();
  
              sq2200 = new JButton();
              sq2201 = new JButton();
              sq2202 = new JButton();
              sq2210 = new JButton();
              sq2211 = new JButton();
              sq2212 = new JButton();
              sq2220 = new JButton();
              sq2221 = new JButton();
              sq2222 = new JButton();
  
              grid00.add(sq0000);
              grid00.add(sq0001);
              grid00.add(sq0002);
              grid00.add(sq0010);
              grid00.add(sq0011);
              grid00.add(sq0012);
              grid00.add(sq0020);
              grid00.add(sq0021);
              grid00.add(sq0022);
  
              grid01.add(sq0100);
              grid01.add(sq0101);
              grid01.add(sq0102);
              grid01.add(sq0110);
              grid01.add(sq0111);
              grid01.add(sq0112);
              grid01.add(sq0120);
              grid01.add(sq0121);
              grid01.add(sq0122);
  
              grid02.add(sq0200);
              grid02.add(sq0201);
              grid02.add(sq0202);
              grid02.add(sq0210);
              grid02.add(sq0211);
              grid02.add(sq0212);
              grid02.add(sq0220);
              grid02.add(sq0221);
              grid02.add(sq0222);
  
              grid10.add(sq1000);
              grid10.add(sq1001);
              grid10.add(sq1002);
              grid10.add(sq1010);
              grid10.add(sq1011);
              grid10.add(sq1012);
              grid10.add(sq1020);
              grid10.add(sq1021);
              grid10.add(sq1022);
  
              grid11.add(sq1100);
              grid11.add(sq1101);
              grid11.add(sq1102);
              grid11.add(sq1110);
              grid11.add(sq1111);
              grid11.add(sq1112);
              grid11.add(sq1120);
              grid11.add(sq1121);
              grid11.add(sq1122);
  
              grid12.add(sq1200);
              grid12.add(sq1201);
              grid12.add(sq1202);
              grid12.add(sq1210);
              grid12.add(sq1211);
              grid12.add(sq1212);
              grid12.add(sq1220);
              grid12.add(sq1221);
              grid12.add(sq1222);
  
              grid20.add(sq2000);
              grid20.add(sq2001);
              grid20.add(sq2002);
              grid20.add(sq2010);
              grid20.add(sq2011);
              grid20.add(sq2012);
              grid20.add(sq2020);
              grid20.add(sq2021);
              grid20.add(sq2022);
  
              grid21.add(sq2100);
              grid21.add(sq2101);
              grid21.add(sq2102);
              grid21.add(sq2110);
              grid21.add(sq2111);
              grid21.add(sq2112);
              grid21.add(sq2120);
              grid21.add(sq2121);
              grid21.add(sq2122);
  
              grid22.add(sq2200);
              grid22.add(sq2201);
              grid22.add(sq2202);
              grid22.add(sq2210);
              grid22.add(sq2211);
              grid22.add(sq2212);
              grid22.add(sq2220);
              grid22.add(sq2221);
              grid22.add(sq2222);
  
              center.add(grid00);
              center.add(grid01);
              center.add(grid02);
              center.add(grid10);
              center.add(grid11);
              center.add(grid12);
              center.add(grid20);
              center.add(grid21);
              center.add(grid22);
  
              add(center, BorderLayout.CENTER);
  
          }
  
          public static void main(String[] args) {
              BoardGui gui = new BoardGui();
              gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              gui.setSize(700, 700);
              gui.setResizable(true);
              gui.setVisible(true);
              gui.setTitle("Tic Tac Toe Extreme");
          }
  
      }
  </code></pre>