Connect Four GUI Help needed

Hi, my name is Hobbs and I'm obviously new to these forums. Im a beginner Java student who right now is in a bit of trouble. For my final project I am suppose to make a connect four game complete with GUI. Unfortunately we were not taught GUI in the class and the only chapter in the book tells us how to make a window with buttons. I think the rest of my code is good but I have no idea how to make the game board to show pieces and have it work with my array and such. Any help is appreciated.

Link to Code
import java.awt.*; import java.awt.event.*; import javax.swing.*; import java - Pastebin.com

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Code :

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.MouseInputListener;
 
public class Project {
 
  public static void main(String args[]){
   boolean continuePlay = true;
   int player1Score = 0;
   int player2Score = 0;
 
 
   JFrame game = new Connect4(); //call the gameboard
  }
 }
 
class Connect4 extends JFrame
{
 final static int NUMROWS = 6;
 final static int NUMCOLUMNS = 7;
 final int EMPTY = 0;
 static int currentPlayer = 0;
 int playerNumber = 1;
 static int[][] gameboard = new int[NUMCOLUMNS][NUMROWS];
 int x;
 
 //create the game board GUI
 private JFrame board;
 
 //create a place in the game board for the pieces
 private JLabel[][] grid;
 
 //Constructor (Make the Game Board)
 public Connect4()
 {
 
  //set the game board to blank
  for ( int y = 0 ; y < NUMROWS ; y++ ) 
  {
   for ( int x = 0 ; x < NUMCOLUMNS ; x++)
   {
    gameboard[x][y] = EMPTY ;
   }
  }
 
  //create a GUI
  board = new JFrame("Connect 4");
  JPanel panel = (JPanel) board.getContentPane();
  board.setContentPane(panel);
 
  // 10 x 10 for each disk and then 10 x 10 for the buttons
  board.setSize(750 , 750);
  board.setVisible(true);
  //panel.setLayout(new GridLayout( (NUMROWS + 1),NUMCOLUMNS));
  grid = new JLabel[NUMCOLUMNS][NUMROWS];
 
  //create the individual Jlabels
  for (int y = 0 ; y < NUMROWS ; y++)
  {
   for ( int x = 0 ; x < NUMCOLUMNS ; x++)
   {
    grid[x][y] = new JLabel();
   // panel.add(grid[x][y]);
   }
  }
 
  //create buttons above the columns
  JButton jbtcol0 = new JButton("Column 1");
  JButton jbtcol1 = new JButton("Column 2");
  JButton jbtcol2 = new JButton("Column 3");
  JButton jbtcol3 = new JButton("Column 4");
  JButton jbtcol4 = new JButton("Column 5");
  JButton jbtcol5 = new JButton("Column 6");
  JButton jbtcol6 = new JButton("Column 7");
 
  //add buttons to the board
  JPanel buttonPanel = new JPanel();
  buttonPanel.add(jbtcol0);
  buttonPanel.add(jbtcol1);
  buttonPanel.add(jbtcol2);
  buttonPanel.add(jbtcol3);
  buttonPanel.add(jbtcol4);
  buttonPanel.add(jbtcol5);
  buttonPanel.add(jbtcol6);
 
  //add panel to the game board
  board.add(buttonPanel);
 
  //Register Listeners for the buttons
  Column_1ListenerClass listener0 = new Column_1ListenerClass();
  Column_2ListenerClass listener1 = new Column_2ListenerClass();
  Column_3ListenerClass listener2 = new Column_3ListenerClass();
  Column_4ListenerClass listener3 = new Column_4ListenerClass();
  Column_5ListenerClass listener4 = new Column_5ListenerClass();
  Column_6ListenerClass listener5 = new Column_6ListenerClass();
  Column_7ListenerClass listener6 = new Column_7ListenerClass();
  jbtcol0.addActionListener(listener0);
  jbtcol1.addActionListener(listener1);
  jbtcol2.addActionListener(listener2);
  jbtcol3.addActionListener(listener3);
  jbtcol4.addActionListener(listener4);
  jbtcol5.addActionListener(listener5);
  jbtcol6.addActionListener(listener6);
 
 }
 
 //reset the game board
 public void reset(){
  for( int y = 0 ; y < NUMROWS ; y++)
  {
   for ( int x = 0 ; x < NUMCOLUMNS ; x++)
   {
    //Game logic to blank
    gameboard[x][y] = EMPTY;
 
    //GUI update to blank
   }
  }
 }
 
  public static void changePlayer()
  {
   if (currentPlayer == 0) 
     currentPlayer = 1;
   else if (currentPlayer == 1)
     currentPlayer = 2;
   else currentPlayer = 1;
  }
 
  public static boolean canDropDisk ( int x )
  {
   if ( gameboard[x][0] == 0) 
     return true;
   else 
     return false;
  }
 
  public int diskLands(int x)
  {
   for ( int y = NUMROWS ; y <= 0 ; y-- )
   {
    if (gameboard[y][x] == 0) 
      return y;
    }
 
   return 0;
   }
 
  public static void dropDisk(int x)
  {
   //update array
   for ( int y = NUMROWS ; y <=0 ; y--)
   {
    if(gameboard[y][x] == 0)
    {
     gameboard[y][x] = currentPlayer;
    }
   }
   changePlayer();
  }
 
  public boolean didWin()
  {
   int numMatches;
 
   // check horizontally
   for ( int y = 0 ; y < NUMROWS ; y++)
   {
    numMatches = 0;
    for ( int x = 0 ; x + 1 < NUMCOLUMNS ; x++)
    {
     if ( ( gameboard[y][x] == gameboard[y][x+1]) && (gameboard[y][x] > 0) ) numMatches++;
     if (numMatches == 4)
       return true;
    }
   }
 
   //check vertically
   for ( int x = 0 ; x < NUMCOLUMNS ; x++)
   {
    numMatches = 0;
    for ( int y = 0 ; y + 1 < NUMROWS ; y++)
    {
    if ( ( gameboard[y][x] == gameboard[y+1][x]) && (gameboard[y][x] > 0 )) numMatches++;
    if ( numMatches == 4) 
      return true;
    }
   }
 
   //check right slanted diagonal
   for ( int y = 3 ; y < NUMROWS ; y++)
   {
    numMatches = 0;
    for ( int x = 0 ; x < 4 ; x++)
    {
     if ((gameboard[y][x] == gameboard[y+1][x+1]) && (gameboard [y][x] == gameboard[y+2][x+2]) && (gameboard[y][x] == gameboard[y+3][x+3]) && (gameboard[y][x] > 0)) 
       return true;
    }
   }
 
   //check left slanted diagonal
   for ( int y = 3 ; y < NUMROWS ; y ++)
   {
    numMatches = 0;
    for ( int x = 3 ; x < NUMCOLUMNS ; x++)
    {
     if ((gameboard[y][x] == gameboard[y-1][x-1]) && (gameboard [y][x] == gameboard[y-2][x-2]) && (gameboard[y][x] == gameboard[y-3][x-3]) && (gameboard[y][x] > 0)) 
       return true;
    }
   }
 
   return false;
 
  }
 
  public int whoWon()
  {
   int numMatches;
   int matchingNumber = 0;
 
   // check horizontally
   for ( int y = 0 ; y < NUMROWS ; y++)
   {
    numMatches = 0;
    for ( int x = 0 ; x + 1 < NUMCOLUMNS ; x++){
     if ( ( gameboard[y][x] == gameboard[y][x+1]) && (gameboard[y][x] > 0) )
     {
      numMatches++;
      matchingNumber = gameboard[y][x];
     }
     if (numMatches == 4) return matchingNumber;
    }
   }
 
   //check vertically
   for ( int x = 0 ; x < NUMCOLUMNS ; x++)
   {
    numMatches = 0;
    for ( int y = 0 ; y + 1 < NUMROWS ; y++)
    {
    if ( ( gameboard[y][x] == gameboard[y+1][x]) && (gameboard[y][x] > 0 )) 
    {
     numMatches++;
     matchingNumber = gameboard[y][x];
    }
    if ( numMatches == 4) return matchingNumber;
    }
   }
 
   //check right slanted diagonal
   for ( int y = 3 ; y < NUMROWS ; y++)
   {
    numMatches = 0;
    for ( int x = 0 ; x < 4 ; x++){
     if ((gameboard[y][x] == gameboard[y+1][x+1]) && (gameboard [y][x] == gameboard[y+2][x+2]) && (gameboard[y][x] == gameboard[y+3][x+3]) && (gameboard[y][x] > 0)) 
       return (gameboard[y][x]);
    }
   }
 
   //check left slanted diagonal
   for ( int y = 3 ; y < NUMROWS ; y ++)
   {
    numMatches = 0;
    for ( int x = 3 ; x < NUMCOLUMNS ; x++)
    {
     if ((gameboard[y][x] == gameboard[y-1][x-1]) && (gameboard [y][x] == gameboard[y-2][x-2]) && (gameboard[y][x] == gameboard[y-3][x-3]) && (gameboard[y][x] > 0)) 
       return (gameboard[y][x]);
    }
   }
 
   return matchingNumber;
  }
 
}
 
class Disk extends JLabel{
 
 public void animateFall(int column , int row, int player){
  //create a disk that starts above the top row in that column and falls to the desired row
  repaint();
 }
 
 protected void paintComponent(Graphics G){
 
 }
}
 
class Winner extends JLabel{
 
}
 
 
class Column_1ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(0) ){
   Connect4.dropDisk(0);
  }
 }
}
 
class Column_2ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(1) ){
   Connect4.dropDisk(1);
  }
 }
}
 
class Column_3ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(2) ){
  Connect4.dropDisk(2); 
  }
 }
}
 
class Column_4ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(3) ){
   Connect4.dropDisk(3);
  }
 }
}
 
class Column_5ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(4) ){
   Connect4.dropDisk(4);
  }
 }
}
 
class Column_6ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(5) ){
   Connect4.dropDisk(5);
  }
 }
}
 
class Column_7ListenerClass implements ActionListener{
 public void actionPerformed(ActionEvent e){
  if (Connect4.canDropDisk(6) ){
   Connect4.dropDisk(6);
  }
 }
}

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The tutorials are a good place to start for learning how to write GUI:
Trail: Creating a GUI With JFC/Swing (The Java™ Tutorials)

Thanks. Il check that out and ask more questions if i have them